Question

the age of A and B are in the ratio 5 ratio 7 . four years from now the ratio of their ages will be 3:4.the present age of b is​

Answer 1

Answer:

A age=20 years

B age =28 years

Step-by-step explanation:

 Let the common ratio of their ages be x

Let the A's age be 5x and B's age be 7x

Five years later:-

A age=5x+4

B age=7x+4

According to question....

5x+4 = 3

7x+4  = 4

By cross-multiplication,We get,

4(5x+4)=3(7x+4)

20x+16=21x+12

16-12=21x-20x

4=x

x=4

Present age of A=5x

                           =5×4 =20 years

Present age of B=7x

                           =7×4=28 years