If the simple interest on the sum of Rs. A at 5% per annum for 3 years is thrice the simple interest on Rs. B at 7% per annum for four years. Find the ratio of A and B.

11 : 21 1 : 31 48 : 17 28 : 5

28 : 5

\(\frac{A × 5 × 3}{100}\) = 3(\(\frac{B × 7 × 4}{100}\)) A × 5 = B × 7 × 4 A : B = 28 : 5