我唔識做3條 F.1 既英文數 (EaSy)
1) The length of a piece oc cloth shrinks by 10% after washing. How long should Jane buy if she wants to have 1.8m of cloth after washing??
2) 2/3 of a number is greater than 20% of 60 by 7.Find the number.
唔該有心人入!
2008-01-13 3:07 am
回答 (2)
2008-01-13 3:15 am
✔ 最佳答案
1) 1.8 / (1-10%)= 2m
2) Let the number be x
2/3 x - 7 = 20% (60)
2/3 x - 7 = 12
2/3 x = 19
x = 19 x 3/2
= 57/2
2008-01-13 4:14 am
1.The length of the cloth she should buy
=1.8 / (1-10%)
=1.8 / 90%
=1.8 / 190/100
=1.8 (100/90)
=2 (m)
2.
Let x be the no.
2/3 (x) = 60 (20%) + 7
2x = 3(12 + 7)
2x = 19 (3)
2x = 57
x = 28.5
.
. .The no. is 28.5
=1.8 / (1-10%)
=1.8 / 90%
=1.8 / 190/100
=1.8 (100/90)
=2 (m)
2.
Let x be the no.
2/3 (x) = 60 (20%) + 7
2x = 3(12 + 7)
2x = 19 (3)
2x = 57
x = 28.5
.
. .The no. is 28.5
收錄日期: 2021-04-13 14:56:19
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080112000051KK03514