Question

英文的数学题！大家帮帮忙！可是，我分不多....这是我的全部了!

1.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.
2.The number of participants in a reading programme increases from 8 to 32. Find the percentage increse in the number of participants.
3. After a metal rod has been cooled down, the lenght reduces from 8 cm to 7.88cm. Find the percentage decrease in the length.
4.Emily has 24 unread emails in her mailbox, in which 6 of them are received today. Fing the percentage incerase in the unread ermils today.
5.Ther were 12 batteries in each pack of brand A battery. If the manufacturer increses the number of batteries by 25% each pack, how many batteries are there in a new pack of brand A battery.
6.Last year, 320 students participated in the sports day of a school. This year, the number of participants decreased by 37.5%. How many students participated in the sports day this year.
7.There are 21 classmates joining Betty's birthday party this year, which is 5% more than last year,s. How many classmates joined the birthday party last year.

Answer 1

小学生的数学题嘛....
你可以自己做啊
懂点英文的都会
1 6/80*100%
2. (32-8)/8*100%
3. (8-7.88)/8*100%
4. 6/(24-6)*100%
5 12(1+0.25)
6. 320(1-0.375)
7. 21(1-0.05)

Answer 2

??????????????????????????????????????