if (25%a)=(50%b) what is % of (a+b)?

Question

what percent of (a+b) equals (50% of a + 25% of b)?

Answer 1

Since (a + b) is not a rational factor of (0.5a + 0.25b), the percentage cannot be determined.

 

If the question were, "What percent of (a + b) is (0.8a + 0.8b) that would be

 

x · (a + b) = (0.8a  + 0.8b)

x · (a + b) = 0.8(a + b)

x = 0.80

x = 80%