题目不全,本人猜测题目原来是:将30Kg温度为10摄氏度的水与40Kg温度为80摄氏度的水混合后,温度为多少?解:根据题意,可知:总热量是不变的;Q总 = 30 * 10 * C + 40 * 80 *C = 3500CT = Q总/(M总 * C) = (3500C) / [(30+40) * C] = 50 (摄氏度)