Question

Please answer it for me

Answer 1

Solution.

Let the ages of A and B are 5x and 7x respectively.
Now, four years later or now...
Age of A be (5x+4) and Age of B be (7x+4).
Thus, ATQ..
5x+4 ÷ 7x+4 = 3/4
4 (5x+4) = 3(7x+4)
20x + 16 = 21x + 12
16-12 = 21x - 20x
➡➡ x = 4....
B = 7 × 4 = 28.
So age of B is 28 years...

Hence,, Option b.) is correct.


HOPE THIS WILL HELP YOU. ✌✌☺

Answer 2

let age be
5x & 7x
4 years later
5x+4 and 7x+4
New ratio = 3:4

sol.

5x+4 / 7x+4 = 3/4
cross multipled
4(5x+4) = 3(7x+4)
20x+16 = 21x+12
21x-20x = 16-12
x = 4

put value At B
7x
7*4=28

28 Ans