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標題:

f.1 maths

發問:

May is counting her money.There are two types of coins:$2 and $5. The total number of coins is 85 and the total value is $275. Find the number of each type of coins. solution: Let x be the number of $2 coins,then the number of $5 coins is__________. ______+______=______

最佳解答:

Let there are x $2 coins, then (85 - x) is the number of $5 coins From the given condition, 2x + 5(85 - x) = 275 -3x + 425 = 275 3x = 150 x = 50 So, there are 50 $2 coins, and 85 - 50 = 35 $5 coins.

其他解答:

Let x be the number of $2 coins,then the number of $5 coins is____85-x______. _2x_____+__5(85-x)____=_275_____ x=50 $2have50 $5 have35

 

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