Rob spent 25%, percent more time on his research project than he had planned. He spent an extra h

hours on the project.

Which of the following expressions could represent the number of hours Rob actually spent on the project?

Rob spent 25% extra percent on his project than the had planned.

Let us assume total number of hours spent x hours.

Given that he spent an extra h hours on the project

So, we could say 25% of x is h.

0.25 x = h.

Dividing both sides by 0.25.

We get 0.25h/0.25 = h/0.25.

x = h/0.25.

Let us convert 0.25 into fractions.

0.25 = 25/100 = 1/4.

Therefore,

x = h/1/4 = 4h.

Therefore, Rob planned 4h hours.

He spent h hours extra.

So, he spent total 4h+h = 5h hours total.

Therefore, 5h expressions could represent the number of hours Rob actually spent on the project.