Solution: Suppose that each kilogram 18 yuan candy needs X kilograms, and each kilogram 10 yuan candy needs Y kilograms. According to the meaning of the question, we can get the equation:18x+10y =15 (x+y) (1).

X+y= 100 (2) The solution of the binary linear equations composed of (1) and (2) is x=62.5 y=37.5.

Answer it yourself below.