I'll give you a question, please answer with step-by-step reasoning process.
Paul went to a shop to buy some groceries. He bought some bread for $2, butter for $3, and juice for two times the price of the bread. He had $15 for his shopping. How much money did Paul have left?

6
The price of the juice was 2 * 2 = $4.

So in total he paid for his shopping 2 + 3 + 4 = $9.

That means he had 15 - 9 = $6 left.

.

Thus, the answer is 6