156 A tank contains 10000 gallons of a solution that is 5 percent sodium chloride by volume. If 25000 gallons of water evaporate from the tank, the remaining solution will be approximately what percent sodium chloride ? A 1.2% B 3.75% C 6.25% D 6.67% E 11.7% 答案D 但我算出來是 5% 題目說2500蒸發了，那麼就表示有相同比例的chloride也會跟著蒸發呀 OG為何還是用500/7500呢 ? 我的算法是 500/10000=x/7500 , x=375 故 375/7500=0.05 答案5% 請問牛牛們 哪邊思路錯了呢? 感謝再感謝
