Can anyone solve it please. - Page 3

yasirzeb2006 · #21 Saturday, September 25, 2010

@ ayesha ! thanks alot , also solve this one if you can

A & B can finish a piece of work in 30 days. B and c in 40 days,while c and a in 60 days . how long will they take to finish it together

a- 26 2/3 days(26 whole 2 by 3)
b- 25 days
c- 14 days
d - 16 days

@ bear! thanks bro.... inshallah i will buy it very soon. thnks again for ur response

bear · #22 Saturday, September 25, 2010

@ Ayesha Mahmood thanks for solving and correcting the wrong ones

@ yasirzeb2006 bro the remaining 3 are here and plz see this link too
http://way2freshers.com/aptitude/apt...-and-work.html

1---- A & B can finish a piece of work in 30 days. B and c in 40 days,while c and a in 60 days . how long will they take to finish it together

a- 26 2/3 days(26 whole 2 by 3)
b- 25 days
c- 14 days
d - 16 days

2--- x and y together can do a piece of work in 6 days and x alone can do it in 9 days. y alne will do it in ?

a- 10 1/2 days
b- 18 days
c-12 days
d- 7 1/2 days
e- 20 days

3--- 15 women can reap the field in 30 days . when should 5 women leave the work , if the whole field is to reaped in 22 1/2 (22 and half)days after they leave the work???

a- 2 days
b- 30 days
c - 7 days
d- 15 days
e -25 days

yasirzeb2006 · #23 Saturday, September 25, 2010

@ bear 1---- A & B can finish a piece of work in 30 days. B and c in 40 days,while c and a in 60 days . how long will they take to finish it together

a- 26 2/3 days(26 whole 2 by 3)
b- 25 days
c- 14 days
d - 16 days

while solving this why u multiplied 2

2(1/A+1/B+1/C) ???????

Ayesha Mahmood · #24 Saturday, September 25, 2010

Quote:

Originally Posted by yasirzeb2006

@ bear 1---- A & B can finish a piece of work in 30 days. B and c in 40 days,while c and a in 60 days . how long will they take to finish it together

a- 26 2/3 days(26 whole 2 by 3)
b- 25 days
c- 14 days
d - 16 days

while solving this why u multiplied 2

2(1/A+1/B+1/C) ???????

this is by adding all the three equations

you'll have 1/a, 1/b, 1/c two times so you take 2 common

sibgakhan · #25 Monday, October 11, 2010

plz solve these questions and also xplain d solution...THanks in advance

Q.1 Ali is 67.His son rehan is 29.In How many years will rehan be exactly half his father’s age?

Q.2 Of d 20 ppl who won prize money, 7 have come forward to claim their winnings. what percent of the ppl have not yet appeared?

Q.3 If the result obtained by multiplying a num, x, by a num 1 less than itself is 4 less than multiplying x by itself, then x=?

Q.4 If 3m<48 and 2m>24 than m will be equal to?

Q.5 what single discount is equivalent to two successive discounts of 10% and 15%?

Ayesha Mahmood · #26 Tuesday, October 12, 2010

Q.1 Ali is 67.His son rehan is 29.In How many years will rehan be exactly half his father’s age?

Ans:

Difference in ages = 38 years
so when Ali will be 38 + 38 = 76 years old his son rehan will be 38 years old which is half the age of rehan.
hence after 38-29 = 9 years Rehan will be exactly half his father's age.

Q.2 Of d 20 ppl who won prize money, 7 have come forward to claim their winnings. what percent of the ppl have not yet appeared?

Ans:

Total no. of people not yet appeared = 20 - 7 = 13
Percentage of people not yet appeared = no. of people not appered * 100 / total no. of people
= 13 * 100/ 20 = 80%

Q.3 If the result obtained by multiplying a num, x, by a num 1 less than itself is 4 less than multiplying x by itself, then x=?

Ans:

by given condition product of x and x-1 is 4 less than x^2
so we get
x(x-1)+4 = x^2
=> x^2 - x + 4 - x^2 = 0
=>x = 4

Q.4 If 3m<48 and 2m>24 than m will be equal to?

Ans;

3m<48 => m<16
and
2m>24 => m>12 or 12<m
so 12<m<16
so if m is an integer then m = 13, 14 or 15
otherwise
m lies in the interval (12,16)

Q.5 what single discount is equivalent to two successive discounts of 10% and 15%?

Ans:

let total price = x then
10% of x = 0.1x
so price will be = 0.9x
and 15% more discount on it will be = 15/100 * 0.9x
=0.135x
so price will be = 0.9x - 0.135x = 0.865x
so total discount is = 0.235x = 23.5 % x
thus a single discount of 23.5% is equal to two successive discounts of 10% and 15%.

sibgakhan · #27 Tuesday, October 12, 2010

Quote:

Originally Posted by Ayesha Mahmood

Q.1 Ali is 67.His son rehan is 29.In How many years will rehan be exactly half his father’s age?

Ans:

Difference in ages = 38 years
so when Ali will be 38 + 38 = 76 years old his son rehan will be 38 years old which is half the age of rehan.
hence after 38-29 = 9 years Rehan will be exactly half his father's age.

Q.2 Of d 20 ppl who won prize money, 7 have come forward to claim their winnings. what percent of the ppl have not yet appeared?

Ans:

Total no. of people not yet appeared = 20 - 7 = 13
Percentage of people not yet appeared = no. of people not appered * 100 / total no. of people
= 13 * 100/ 20 = 80%

Q.3 If the result obtained by multiplying a num, x, by a num 1 less than itself is 4 less than multiplying x by itself, then x=?

Ans:

by given condition product of x and x-1 is 4 less than x^2
so we get
x(x-1)+4 = x^2
=> x^2 - x + 4 - x^2 = 0
=>x = 4

Q.4 If 3m<48 and 2m>24 than m will be equal to?

Ans;

3m<48 => m<16
and
2m>24 => m>12 or 12<m
so 12<m<16
so if m is an integer then m = 13, 14 or 15
otherwise
m lies in the interval (12,16)

Q.5 what single discount is equivalent to two successive discounts of 10% and 15%?

Ans:

let total price = x then
10% of x = 0.1x
so price will be = 0.9x
and 15% more discount on it will be = 15/100 * 0.9x
=0.135x
so price will be = 0.9x - 0.135x = 0.865x
so total discount is = 0.235x = 23.5 % x
thus a single discount of 23.5% is equal to two successive discounts of 10% and 15%.

AOA Ayesha

according to book the CORRECT ans of the above questions are.....

Q.2 65%
Q3. 3
Q4. 10
Q5. 24.5%

i dount know how the ans comes but these are the correct ans given at the end of chapter.

bear · #28 Wednesday, October 13, 2010

ayesha is correct in all except Q2 where there is a miscalculation but her procedure is correct

Quote:

Q.1
9 is correct

Quote:

Q.2

a miscalculation by ayesha

13 * 100/ 20 = 65 %

you mistakenly wrote 80

Quote:

Q.3

4*3 = 12 which is 4 less than 16(4^2)

generally (X^2) - X + X = X^2
if its 5 less then x= 5 (5*4 =20 which is 5 less than 25(5^2) )
if 6 less then x = 6 (6*5 = 30 which is 6 less than 36(6^2) )

Quote:

Q.4
she is correct
beacuse if you use 10 then
3m<48 -------> 30<48 (ok)
2m>24-------> 20 > 24 ( wrong)

hence 10 is wrong

Quote:

Q.5
1 - (.90 *.85 ) = 0.235 = 23.5%

sibgakhan · #29 Friday, October 29, 2010

Question 1

Solve the two sided inequality and show the solution on real line
7 < 1-2x ≤ 10

Question 2

Given two functions as:
f(x) = and g(x) =
Find fog(x) also find the domain of f, g and fog

Question 3

Simplify, then apply the rules of limit to evaluate
lim x->3 x3(power3)-5x2(power2)+6x/x2(power2)-9

sibgakhan · #30 Friday, October 29, 2010

here are the values

Quote:

Originally Posted by sibgakhan

[Question 2

Given two functions as:

f(x)=x2(x square)-x-1 and g(x) =3/x

Find fog(x) also find the domain of f, g and fog