Question

Best bet moving company charges 800 dollars plus 16 dollars per hour. Third bet moving company charges 720 dollars plus 21 dollars per hour. At what number of hours will the charge by both companies be the same?

Answer 1

Let
x------------> the number of hours
y------------> the charge in dollars

we know that

Best bet moving company
y=800+16x

Third bet moving company
y=720+21x

the charge by both companies will be the same when
800+16x=720+21x
21x-16x=800-720
5x=80
x=80/5-------> x=16  hour

the answer is
16 hours