1). 30% of Anna's beads are pink, 30% of them are yello and 40% of the rest are green. If she has 4 more pink beads than green ones, how many paper clips does she have?
2). 20% of girl like Swimming, 35% of girl like Basket Ball, 15% like Golf and 5% like Badminton. If the 5% = 12 girls, how many girl like basket ball?
P.6 Math
2008-01-12 10:04 am
回答 (2)
2008-01-12 11:12 am
✔ 最佳答案
1)Anna's beads are y(y-30%y-30%y)40%=30%y-4
40%yx40%=30%y-4
16%y=30%y-4
4=30%y-16%y
4=14%y
4÷14%=y
y=28/4/7
Anna has 28/4/7 beads
2)35/5x12=7x12=84 Ans：84girl like basketball.
2008-01-14 2:09 am
1)Let x be the no. of beads she have.
30%x - 40%[x(1-30%-30%)] = 4
3x/10 - 40%(6x/10) = 4
3x/10 - 2/5(6x/10) = 4
3x/10 - 12x/50 = 4
15x/50 - 12x/50 = 4
3x/50 = 4
3x = 200
x = 200/3
2)12x(35/5)
=12x7
=84
30%x - 40%[x(1-30%-30%)] = 4
3x/10 - 40%(6x/10) = 4
3x/10 - 2/5(6x/10) = 4
3x/10 - 12x/50 = 4
15x/50 - 12x/50 = 4
3x/50 = 4
3x = 200
x = 200/3
2)12x(35/5)
=12x7
=84
參考: F.1
收錄日期: 2021-04-19 00:16:28
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