Question

If a simple interest on a sum of money at 6%pa, for 7 years is equal to twice of simple interest another sum for 9 years at 5%pa the ratio between sum will be​

Answer 1

Step-by-step explanation:

let sum of money be s1 and s2.

simple interest on s1 at 6%pa for 7 years (SI-1) = (s1×6×7)/100

simple interest on s2 at 5%pa for 9 years (SI-2) = (s2×5×9)/100

acc to ques, (SI-1) = 2×(SI-2)

(s1×6×7)/100 = 2 × (s2×5×9)/100

42 × s1 = 90 × s2

s1/s2 = 15/7. (answer)