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標題:

請幫忙--P.5 數學難題

發問:

請幫忙列式 The price of a long-sleeved shirt is 20% more than the price of a T-shirt. Ken buys 5 such long-sleeved shirts and 7 suchT-shirt for $ 390. Find the price of each long- sleeved shirt.

最佳解答:

The price of a long-sleeved shirt is 20% more than the price of a T-shirt. Ken buys 5 such long-sleeved shirts and 7 suchT-shirt for $ 390. Find the price of each long- sleeved shirt. sol set price of T-shirt is x so price of long-sleeved shirt is 1.2x so 1.2*5+7*x=390 13x=390 x=30 price of long-sleeved shirt is 30*1.2=36

其他解答:

Let long-sleeved shirt = x Let T-shirt = y long-sleeved shirt is 20% more than the price of a T-shirt x = y(1+20%) x = 1.2y y = x/(1+20%) y = x/1.2 Then, 390 = 5(1.2y) + 7(x/1.2) .... (1) Put y = x/1.2 into (1) 390 = 5[(1.2)(x/1.2)] + 7(x/1.2) 390 = 5x + (7x/1.2) 390 = 13x/1.2 x = 36 Therefore, y = 36/1.2 y = 30 Re-calculate: Total price = 5x + 7y = 5(36) + 7(30) = 390 Therefore the price of each long-sleeved shirt is $366A560DB68EC65D60