Question

each piece of fruit stand for a number it's possible to figure out the number for one of the pieces of fruit which fruit must equal a particular number and why

Answer 1

yes it has to be a specific answer because you need to make it equal the same number as a grape. Imagine the grape is a 10 and the orange is a random number the orange has to be a number that will equal the grape witch is 10 so the orange has to be 0.