In a school, 50% of girls wear glasses while 280 of boys wear glasses.If the number of girls wearing glasses is 2/7 of the number of boys,find the number of girls.
(use equation)
I want to ask Maths
2007-08-12 10:24 pm
回答 (1)
2007-08-12 10:33 pm
✔ 最佳答案
let y been the number of girl280*(1-2/7)=y*50%
200=0.5y
y=400
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