Answer:
1 pizza
Explanation:
if they didn't eat 1/2 of the pizza,1/2 is left of 1 pizza
if they didn't eat 2/4 of the other pizza,2/4 is left if the other pizza
then there is 1 pizza left
1 pizza was left.
If they didn't eat 1/2 of one pizza, 1/2 is left of one pizza.
If they didn't eat 2/4 of the other pizza, 2/4 is left of that other pizza/
2/4+1/2=2/4+2/4=1
Therefore, 1 pizza was left
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