change the problem so there is a common denominator 15/20 ; 8/20 you eat 8/20 of the 15/20 cereal therefore, multiply the two numbers 6/20 is the remaining amount of cereal in the box 3/4 or 15/20 of the box was there to start but the questions wants how much of the ENTIRE box was eaten with 6/20 of the entire box remaining and 15/20 of the box was left before you ate some of the cereal 15/20-6/20= 9/20 of the box you ate 9/20 of the entire box
