Exercise 5C
5.Tracy got 80 marks in a test.It is found that 6 marks were mistakenly given to her and should be deducted.Find the percentage decrease after the deduction of her marks.
6.the number of participants in a reading programme increases from 8 to 32.Find the percentage increase in the number of participants.
7.After a metal rod has been cooled down,the length reduces from 8 cm to 7.88 cm.Find the percentage decrease in the length.
8.Emily has 24 unread emails in her mailbox,in which 6 of them are received today.Find the percentage increase in the unread email today.
9.There were 12 batteries in each pack of brand A battery.If the manufacturer increases the number of batteries by 25% each pack,how many batteries are there in a new pack of brand A battery?
10.Last year,320 students participated in the sports day of a school.This year,the number of participants decreases by 37.5%.How many students participants in the sports day this year?
11.There are 21 classmates joining Betty’s birthdayparty this year,which is 5% more than last year’s.How many classmates joinedthe birthday party last year?
中一級數學新領域(英文版)問題
2011-12-29 1:15 am
回答 (2)
2011-12-29 4:56 am
✔ 最佳答案
5-8題既題解係the之後去到最尾5-8題既答句係題解之後加is跟住答案
例:5)the percentage decrease after the deduction of her marks
=.....
=.....
∴the percentage decrease after the deduction of her marks is 7.5%
9-11題既題解係there are
9-11題既答句係there are (答案) (many後邊果堆字)
例:11)there are
=.....
=.....
∴there are 20classmates joinedthe birthday party last year.
有d抽象..
5)6/80x100%=7.5%
6)(32-8)/8x100%=300%
7)(8-7.88)/8x100%=1.5
8)6/(24-6) x 100% = 33/1/3%
9)12 x (1+25%) = 15
10) 320 x (1-37.5%) = 200
11) 21/(1+5%) = 20
比我15分thx
參考: 我
2011-12-29 1:37 am
5) [(80-6) - 80]/80 x 100% = -7.5%
6) (32-8)/8 x 100% = 300%
7) (7.88 - 8)/8 x 100% = -1.5%
8) 6/(24-6) x 100% = 33.33%
9) 12 x (1+25%) = 15
10) 320 x (1-37.5%) = 200
11) 21/(1+5%) = 20
6) (32-8)/8 x 100% = 300%
7) (7.88 - 8)/8 x 100% = -1.5%
8) 6/(24-6) x 100% = 33.33%
9) 12 x (1+25%) = 15
10) 320 x (1-37.5%) = 200
11) 21/(1+5%) = 20
收錄日期: 2021-04-13 18:26:56
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