GWD数学题！！！！！继续跪求解答！！！！！

aglair萱

Of the 2500 tons of ore mined daily at a quarry, 0.4 percent results in a certain pure mental. In how many days of mining will the total amount of pure metal produced at the quarry be equal to the daily amount of ore mined?
A 10
B 100
C 250
D 400
E 1000

rainny0906

设需要x天，则：
0.4%*2500*x=2500,求解方程，得x=250

aglair萱

设需要x天，则：
0.4%*2500*x=2500,求解方程，得x=250

-- by 会员 rainny0906 (2011/4/26 22:58:59)

原来是这样哦~~~想太复杂了~~呵呵~THANKS~