shirts as large red shirts. It sold 190 white shirts and 80 red shirts, how many medium shirts did it sell?

　　SA:200 suppose large red=x lw=y then mr=2y, mw=3x

　　x+2y=80 y+3x=190

　　47、老JJ：一个车每小时跑300MILE，问多少秒跑220FEET

　　算比例的很多，数据充分性的题都不难。

　　48. x,y,z,w, x is 20% greate than y, y is 20% greater than z, w is 20% less than x, how much percent greater of z is w?

　　SA: 15.2% /1=15.2%

　　49. one company is planing to display some boxes, the first layer is one, the laster layer has 81 boxes,

　　and the every layer has one less row than the previous layer, and every layer has square shape,

　　ask the total number of boxes. I think the answer is 9^2+8^2+7^2+6^2+5^2+4^2+3^2+2^2+1

　　SA: agree

　　50. the problem about rent car, X company $15/day, $0.2/mile, the y company $20/day, $0.1/mile, asked if rent Xcompanys car one day, it will need $25?

　　SA: 应该是这样的题吧

　　192.从 A公司租一车,每天fixed charged 15刀,每跑一mile 0.2刀,B公司租一车，每天fixed charged20刀,每跑一mile0.1 刀问从A公司租的凉车，跑了xmiles,charge和25刀比

　　1. B公司租一辆,跑了x miles,少于25刀

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