Question

The age of a and b are in a ratio 5:7 4years from now the ratio of their ages will be 3:4. The present age of b will be ??

Answer 1

Answer:

Step-by-step explanation:

If A's age is 5*x, B's age is 7*x.

4 years later, A will be 5*x + 4 years old

4 years later, B will be 7*x + 4 years old

It is given that %285%2Ax+%2B+4%29%2F%287%2Ax+%2B+4%29+=+3%2F4

Cross-multiplying

20%2Ax+%2B+16+=+21%2Ax+%2B+12

x+=+4

So A's age is 20 and B's age is 28.

Check: In 4 years, A will be 24 and B 32. Ratio will be 3:4.