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標題:
Math (20點!!!)
發問:
詳細d~ 1.In a school,55% of the students are boys.If there are 484 boys,find the total number of students in the school. 2.After filling 18125 L of water into a tank,71% of the tank remains unfilled.Find the capacity of the tank. 更新: 1. Global Telecom:21% Peace Telecom:34% Smart Telecom:45% It is know that are 1.32 million fixed line users under Global Telecom and Peace Telecom.How many fixed line users are there in this city?
最佳解答:
1. The total number of students in the school = 484 / 55% = 484 x 100 / 55 = 880 2. The capacity of the tank = 18125 / (1-71%) = 18125 / 29% = 18125 x 100 / 29 = 62500 L 2010-12-10 22:41:47 補充： 1. 解題 (如何得出484/55%?): Let x be the total number of students in the school. 55%x = 484 ...... (total number of students x 55% = the number of boys) x = 484 / 55% 2010-12-10 22:41:53 補充： 2. 解題 (如何得出18125 / (1-71%)?): Let x L be the capacity of the tank. x - 71%x = 18125 ....... (capacity - unfilled volume = filled volume) x (1-71%) = 18125 x = 18125/(1-71%)
其他解答:
1.In aschool，55% of the students are boys.If thereare 484 boys，find the total number of students in the school. Sol 484/0.55=880 880students in the school. 2.After filling 18125L of water into a tank，71% of the tank remains unfilled．Find the capacity of the tank. 18125L/(1－0.71) =62500L capacityof the tank is 62500L6A560DB68EC65D60
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