標題:

please help me.Maths....

• 關於Nikon d3100 鏡頭問題
• 中文中學~中六收分一問~@1@
• 緊急maths questions, 唔該幫幫手

• 關於Nikon d3100 鏡頭問題
• 中文中學~中六收分一問~@1@
• 緊急maths questions, 唔該幫幫手

 

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發問:

A group of students were to choose between playing table-tennis and football.The number of students choosing table-tennis was three times that of those choosing football.Asking 12 students who chose table-tennis to play football would make the number of players for each game equal.Find the number of students who... 顯示更多 A group of students were to choose between playing table-tennis and football.The number of students choosing table-tennis was three times that of those choosing football.Asking 12 students who chose table-tennis to play football would make the number of players for each game equal.Find the number of students who chose table-tennis originally.(ans:36) Jim has 25 sweets and May has 55.How many sweets must Jim give May so that May will have 4 times as many as Jim?(ans;9)

最佳解答:

Let no. of student plaing table tennis be x, .... football be y, x=3y --------------------(1) x-12=y+12 -----------------(2) Put (1) into (2), 3y-12=y+12 2y=24 y=12 Put it into (1), x=3(12) =36 _____________________________________________________ Let the no. john should give is x, 4(25-x) = 55+x 100-4x = 55+x 5x = 45 x = 9

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