Question

Ruby ate 1/3 of a pizza and Angie ate one fifth of the pizza how much of the pizza did they eat in all

Answer 1

1/3 + 1/5
= 5/15 + 3/15
= 8/15
8/15 of the pizza was eaten.

Answer 2

Ruby ate 1/3 of the pizza, and Angie ate 1/5 of it. So to know how much they ate in all, you should add the proportion ate by both.
1/3 + 1/5
First, you should make both fractions the same denominator. You multiply the numerator and denominator of the fraction 1/3 by 5, and those of 1/5 by 3:
1*5/3*5 + 1*3/5*3 = 5/15 + 3/15
Then you add the numerators:
(5+3)/15 = 8/15

So they both ate 8/15 of the Pizza.

Hope this Helps! :)