A sum of Rs. 1550 was lent partly at 5% and partly at 8% simple interest. The total interest received after 3 years is Rs.300. The ratio of money lent at 5% to that at 8% is:

Explanation:

Avg. rate of interest

=300\1550×200\31%

By using mixture and Alligation Rule

Note: Always remember to solve such type of questions multiply by 31 in both parts.

Required Ratio=16:15