Answer:
3/8
Explanation:
In order to find the fraction of the pizza left uneaten, we can subtract the fractions that John and Lisa ate from 1 (whole pizza).
John ate 3/8 of the pizza, and Lisa ate 1/4 of it.
To find the combined fraction they ate, add their fractions:
3/8 + 1/4
To add these fractions, we need a common denominator, which is 8 in this case:
3/8 + 2/8
Now that we have a common denominator, we can add the numerators:
(3 + 2)/8 = 5/8
So, John and Lisa together ate 5/8 of the pizza.
To find the fraction left uneaten, subtract this from 1:
1 - 5/8 = 8/8 - 5/8 = 3/8
So, 3/8 of the pizza is left uneaten.