Diane bought 15 + 20 = <<15+20=35>>35 apples.

Therefore, they bought 15 + 35 = <<15+35=50>>50 apples altogether.

# Answer

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Question:
Diane bought twenty more apples than Cecile. If Cecile bought 15 apples, how many apples did they buy altogether?
Answer:
Let's think step by step.

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50
Diane bought twenty more apples than Cecile. If Cecile bought 15 apples, how many apples did they buy altogether?
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