On a certain baseball team, 1 out of 5 batters hit the ball. If 2 out of every 10 batters who hit the ball score a home-run, and there are 20 batters who've hit home-runs, how many players have been up to bat?	Choose one
A) 500  B) 50  C) 100  D) 5,0000  E) 2,000
Proportions: Let B = batters, and Bh = batters hit the ball, and Bhr = batters hit the ball and home-run.   20Bhr/xBh = 2Bhr/10Bh   xBh = 100Bh   1Bh/5B = 100Bh/yB   yB = 500B   500nswer: 500
<result>A</result>
On a certain baseball team, 1 out of 5 batters hit the ball. If 2 out of every 10 batters who hit the ball score a home-run, and there are 20 batters who've hit home-runs, how many players have been up to bat?