The total number of $5 and $10 coins in a bag is 12. The number of $10 coins is equal
to 2 times the number of $5 coins.Find the number of $5 coins.
(PLEASE USE ENGLISH)
方程式~english~
2006-11-04 3:09 am
回答 (4)
2006-11-04 3:17 am
✔ 最佳答案
Let x be the number of $5 coins x+2x=12
3x=12
x=4
there are 4 $5 coins
參考: me
2006-11-04 3:18 am
Let x be the number of $5 coins
2x+x=12
3x/3=12/3
x=4
∴There has 4 $5 coins
2x+x=12
3x/3=12/3
x=4
∴There has 4 $5 coins
參考: me
2006-11-04 3:17 am
Let the number of $5 coins be x , the number of $10 coins be y
x + y = 12 -------(1)
y = 2 x -----------(2)
Put (2) into (1):
x + 2 x = 12
3 x = 12
x = 4
∴The number of $5 coins is 4 .
x + y = 12 -------(1)
y = 2 x -----------(2)
Put (2) into (1):
x + 2 x = 12
3 x = 12
x = 4
∴The number of $5 coins is 4 .
2006-11-04 3:16 am
let x be the number of $5 coins.
2x+x=12
3x=12
x=12/3
x=4
the number of $5 coins is 4
2x+x=12
3x=12
x=12/3
x=4
the number of $5 coins is 4
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