A book store had 180 novels. There were Chinese, English and Malay novels in the ratio of 4 : 3 : 5. When the book store assistant brought in another 114 new novels, the number of Chinese novels was increased by 40% and the number of English novels was increased by ²₃.

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	4 u	3 u	5 u	180
Change	+ 1.6 u	+ 2 u	+ ?	+ 114
After	5.6 u	5 u	9 u	294

Increase in the number of Chinese novels
= 40% x 4 u
= ⁴⁰₁₀₀ x 4 u
= 1.6 u

Increase in the number of English novels
= ²₃ x 3 u
= 2 u

Total number of novels at first
= 4 u + 3 u + 5 u
= 12 u

12 u = 180

1 u = 180 ÷ 12 = 15

Increase in the number of Chinese and English novels
= 1.6 u + 2 u
= 3.6 u
= 3.6 x 15
= 54

Number of Malay novels brought in
= 114 - 54
= 60 

(b)
Number of Malay novels at first
= 5 u
= 5 x 15
= 75

Percentage increase in Malay novels
= ⁶⁰₇₅ x 100%
= 80%

Answer(s): (a) 60; (b) 80%