Which expression is equivalent to x divided by 3/4

Noor brought 21 sheets of stickers. she gave 1/3 of a sheet to each of the 45 students at recess. she wants to give teachers 1 1/2 sheets each.

Sara made $253 for 11 hours of work. at the same rate how much would he make for 7 hours of work?

Someone which statements are true? check all that apply.