Question

Jos
(a) 4x
(b) 13x
(c) 31x
(d) 11x
The ages of A and B are in the ratio of 5:7. Four years from now the ratio of their ages will be 3:4. what percent age of B​

Answer 1

Step-by-step explanation:

let present age be x and y then four years from their age will be x+4 and y+4

as per question, x/y= 5/7

x=5y/7.

and x+4/y+4= 3/4

4x+16=3y+12

4=3y-4x

put the value of x from above

4=3y-4(5y/7)

4=3y-20y/7

4= (21y-20y) /7

4=y/7

age of B is 28=y or y=28.

then x=5y/7 so age of A will be (5*28)/7 = 20years

now if your question is what percentage of age of B is increased then it will be (24/28)*100