Question

a sum of money double itself in 15 years in how many years will it become 8 times to itself​

Answer 1

2x:15

8x:y

cross multiply

2x*y=8x*15

y=(8x*15)/2x

y=4*15

y=60years

Answer 2

If it doubles in 15 year

Let the number or money be 2

If it doubles then it becomes 4

Doubles again and become 8

Then divide 8 by 2 is 4answer

The 4 into 15 is equal to 60

The answer is 60