Question

solve 13th one ....fast with full solution....

Answer 1

answer is 25
Given A+B=61
So if we take B as 25 then
A+B=61
A+25=61
A=61-25
A=36
Hence
A+B is 61

Answer 2

25 years old.

let A s present age X

B s present age = 61-X

According to Question

when A was 61-X year old B was 4 years less than half of A s present age.

difference between A s past age and present age

X-(61-X) =(-61+2X)
as A s age is decreased by 2X-61

similarly B s age is also decreased by 2X-61
means

B s age was (61-X)- (2X-61) = -3X+122


ATQ

-3X +122 = (A 's present age /2) -4

-3X+122 = X/2 -4

126= X/2 + 3X
7X/2 =126

X=36


So B s present age is (61-X)= 61-36 =25 years.