Answer:
Aiden spent 45 minutes on his science homework.
Explanation:
In word problems like this, it is good to be familiar with the words that they use to indicate which operation (multiplication, addition, division or subtraction) to use. In this problem, we know Aiden spent 'three times' as much time on science or ' x 3 '. Since Aiden spent 15 minutes on his math, we can take that amount of time and multiply by 3 to get the amount of time he spent on science: 15 x 3 = 45 minutes.