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%.