[問題]GWD19-34

[magic]

Q34:
Of the 2,500 tons of ore mined daily at a quarry, 0.4 percent results in a certain pure metal. 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. 1,000

答案是C
請問怎麼算阿??

[Pao]

ㄧ天產0.4% pure material, 計ㄧ天產 0.4%X2500頓 pure material, 要挖幾天所產的pure material 才會等於一天挖礦的數量(2500噸)，計 2500/(0.4%X2500)=250天

[magic]

謝謝唷