Thomas, Toby, and Rebecca worked a total of 157 hours in one week. Thomas worked x hours. Toby worked 10 hours less than twice what Thomas worked, and Rebecca worked 8 hours less than Toby. How many hours did Rebecca work?
Let's think step by step.
56
Toby: 2x - 10.

Rebecca: (2x - 10) - 8 = 2x - 18.

Total:2x - 10 + 2x - 18 + x = 157.

5x - 28 = 157.

5x = 185.

x = 37 hours.

Rebecca:2(37) - 18 = 56 hours.

.

Therefore, the answer is 56