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问题: eglish

a consturuction site has got 5 trucks of cement . in each truck is X tons. when 13 tons are used up,7 tons are left. what is X?

解答:

一座建筑工地有5卡车水泥,每卡车有X吨水泥。当用完13吨后,还剩7吨。X是多少?

5X=13+7,
X=4(TONS)

这是GRE里面的数学题吗?