F-1 MATHS
2006-10-24 3:26 am
Donna has 3types of coins:$1 coins, $2coins, $5coins.The number of$1 coins is three times that of $2coins.Thenumber of $2coins is 5 more than the number of $5coins.The total value of Donna's os $325. How many $2coins does she have?
回答 (2)
2006-10-24 7:31 pm
✔ 最佳答案
let no of $2 coin be x, no of $1 coin be 3x, no of $5 coin be (x - 5)2x + 1*3x + (x - 5)*5 = 325
2x + 3x + 5x - 25 = 325
10x = 350
x = 35
Therefore she has 35 of $2 coins.
2006-10-24 3:33 am
Let x be the no. of $2coins
x+3x+(x-5)=$325
4x+x-5=325
5x-5=325
5x=330
x=66
The no. of $2coins is 66.
x+3x+(x-5)=$325
4x+x-5=325
5x-5=325
5x=330
x=66
The no. of $2coins is 66.
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