Jane and Roger buy one pizza each. Jane eats 4/12 and rogers 5/12. How much pizza is left

Answer 1

When dealing with fractions everything added together has to add up to 1. The amount eaten by Jane plus the amount eaten by Roger plus the amount left over has to add up to 1.

Let x = amt eaten by Jane = 5/12

y = amt eaten by roger = 4/12

z = amount left over

Eq.: x + y + z = 1

5/12 + 4/12 + z = 1

9/12 + z = 1

z = 1 - 9/12

z = 12/12 - 9/12 = 3/12 = 1/4

Therefore, there would be 3/12 or 1/4 of the pizza left.

Hope this helps!