A book store had 680 comics. There were Chinese, English and Malay comics in the ratio of 3 : 6 : 8. When the book store assistant brought in another 352 new comics, the number of Chinese comics was increased by 60% and the number of English comics was increased by
12.
- What was the number of Malay comics that the book store assistant brought in?
- What was the percentage increase in the number of Malay comics?
|
Chinese |
English |
Malay |
Total |
Before |
3 u |
6 u |
8 u |
680 |
Change |
+ 1.8 u |
+ 3 u |
+ ? |
+ 352 |
After |
4.8 u |
9 u |
12 u |
1032 |
Increase in the number of Chinese comics
= 60% x 3 u
=
60100 x 3 u
= 1.8 u
Increase in the number of English comics
=
12 x 6 u
= 3 u
Total number of comics at first
= 3 u + 6 u + 8 u
= 17 u
17 u = 680
1 u = 680 ÷ 17 = 40
Increase in the number of Chinese and English comics
= 1.8 u + 3 u
= 4.8 u
= 4.8 x 40
= 192
Number of Malay comics brought in
= 352 - 192
= 160
(b)
Number of Malay comics at first
= 8 u
= 8 x 40
= 320
Percentage increase in Malay comics
=
160320 x 100%
= 50%
Answer(s): (a) 160; (b) 50%