@ 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

@ Ayesha Mahmood thanks for solving and correcting the wrong ones


@ yasirzeb2006 bro the remaining 3 are here and plz see this link too
[url]http://way2freshers.com/aptitude/aptitude-problems-on-time-and-work.html[/url]


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

[B]a- 26 2/3 days(26 whole 2 by 3)[/B]
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]b- 18 days[/B]
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
[B]d- 15 days[/B]
e -25 days

@ 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) ???????

[QUOTE=yasirzeb2006;215197]@ 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) ???????[/QUOTE]
this is by adding all the three equations

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

plz solve these questions and also xplain d solution...
 

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%?

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

Ans:[/I][/B]

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.


[B][I]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:[/I][/B]

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%

[B][I]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:[/I][/B]

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

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

Ans;[/I][/B]

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)

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

Ans:[/I][/B]

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%.

[QUOTE=Ayesha Mahmood;222195][B][I]Q.1 Ali is 67.His son rehan is 29.In How many years will rehan be exactly half his father’s age?

Ans:[/I][/B]

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.


[B][I]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:[/I][/B]

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%

[B][I]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:[/I][/B]

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

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

Ans;[/I][/B]

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)

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

Ans:[/I][/B]

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%.[/QUOTE]

AOA Ayesha

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

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.

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

[QUOTE]Q.1
9 is correct
[/QUOTE]

[QUOTE]Q.2

a miscalculation by ayesha :shy

13 * 100/ 20 = [B]65[/B] %

you mistakenly wrote 80[/QUOTE]

[QUOTE]Q.3

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

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


[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]


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

[/QUOTE]

plz solve these questions and also xplain d solution...
 

[B]Question 1[/B]

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

[B]Question 2[/B]

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

[B]Question 3[/B]

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

...
 

here are the values
[QUOTE=sibgakhan;233160][[B]Question 2[/B]

Given two functions as:

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

Find fog(x) also find the domain of [B]f, g and fog[/B]
[/QUOTE]