A book store had 910 novels. There were Chinese, English and Malay novels in the ratio of 2 : 7 : 4. When the book store assistant brought in another 434 new novels, the number of Chinese novels was increased by 60% and the number of English novels was increased by ⁴₇.

1. What was the number of Malay novels that the book store assistant brought in?
2. What was the percentage increase in the number of Malay novels?

	Chinese	English	Malay	Total
Before	2 u	7 u	4 u	910
Change	+ 1.2 u	+ 4 u	+ ?	+ 434
After	3.2 u	11 u	5 u	1344

Increase in the number of Chinese novels
= 60% x 2 u
= ⁶⁰₁₀₀ x 2 u
= 1.2 u

Increase in the number of English novels
= ⁴₇ x 7 u
= 4 u

Total number of novels at first
= 2 u + 7 u + 4 u
= 13 u

13 u = 910

1 u = 910 ÷ 13 = 70

Increase in the number of Chinese and English novels
= 1.2 u + 4 u
= 5.2 u
= 5.2 x 70
= 364

Number of Malay novels brought in
= 434 - 364
= 70 

(b)
Number of Malay novels at first
= 4 u
= 4 x 70
= 280

Percentage increase in Malay novels
= ⁷⁰₂₈₀ x 100%
= 25%

Answer(s): (a) 70; (b) 25%