Question

Serena had 20 minutes of math homework on Monday, 35 minutes on Tuesday, and 25 minutes on Wednesday. She spent the same amount of time on homework on Friday as she had on Thursday. She had a total of 110 minutes of math homework for all five days. How many minutes of math homework did Serena have on Thursday?

Answer 1

Monday: 20 min
Tuesday: 35 min
Wednesday: 25 min
Thursday: x min
Friday: x min
Total: 110 min

20 + 35 + 25 + x + x = 110
80 + 2x = 110
2x = 30
x = 15

Serena had 15 minutes of math homework on Thursday.