maths quick
2007-12-01 7:11 am
michelle uses esactly 100 coloured sticks to make a number of pentagons and hexagons. She find that if she doubles the number of hexagons,then the number of pentagons is decreased by 6 and there is no stickleft unused. How many pentagons does Michelle originlly make?
回答 (2)
2007-12-01 7:36 am
✔ 最佳答案
First, let the number of hexagons be x,the number of pentagons be y.
So, x+y=100 (1)
Then, doubles the number of hexagons =2x
the pentagons is decreased by 6 = y-6
2x+(y-6)=100 (2)
(2): 2x+y=106 (3)
(3)-(1): x=6, y=94
Therefore, there are 94 pentagons.
參考: Myself
2007-12-01 7:36 am
Initially the number of pentagon that michelle make is 70 divide by 5. so = 14 and hexagon is 5 .. so when she doubles the number of hexagon, the number of pentagons will be 40 divide by 5, so = 8 and hexagon is 10 and there will be no sticks left . =D
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