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The soil erodibility factor (K-factor) is a quantitative description of the inherent erodibility of a particular soil; it is a measure of the susceptibility of soil particles to detachment and transport by rainfall and runoff.
The sum of two numbers is 25 and their difference is 15. The ratio of the numbers is:
If the ratio of the sum invested and simple interest received after 1 year is 25:9 respectively, then find the rate of interest.