Paul is able to grade p essays every half hour, and Sarah is able to grade s essays every hour. If Paul and Sarah work together grading essays for h hours, then in terms of p, s, and h, how many essays will they grade?Indicate all such amounts.
A.p+sh
B.2p+sh
C.h(p + s)
D.2h(p + s)
E.h(2p + s)
F.h(p + 2s)
G.2hp + hs
我的答案:
Paul is able to grade p essays every half hour, and Sarah is able to grade s essays every hour. If Paul and Sarah work together grading essays for h hours, then in terms of p, s, and h, how many essays will they grade?Indicate all such amounts.