A = 1/2 bh
A = 1/2 (21)(8)
A = 1/2 (168)
A = 84
So, she has 3hrs to grade all papers, for 35 students.. alrite.
the first 5, she does them in 30minutes.. what's the speed rate? well, 5/30 or 1/6
now, she has still 2 hours and a half, or 150 minutes, to do the remaining 30 papers... she has to work at a rate of 30/150 then... which is 1/5 simplified.
now if we take 1/6 as the 100%, what is 1/5 in percentage then?

so 1/5 is 120% in relation to 1/6... meaning the rate of 1/5 she needs to move through, namely 1 paper every 5 minutes, is 20% faster than 1/6.
Large would be 1495
Medium would be 997
Small would be 498
Look a the work I did, it has an equation in it. The equation I got is 3x+2x+x=2940
Answer:
the answer would be eleven