A book shop had 375 novels. There were Malay, Chinese and English novels in the ratio of 3 : 7 : 5. When the book shop assistant brought in another 130 new novels, the number of Malay novels was increased by 40% and the number of Chinese novels was increased by ²₇.

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

	Malay	Chinese	English	Total
Before	3 u	7 u	5 u	375
Change	+ 1.2 u	+ 2 u	+ ?	+ 130
After	4.2 u	9 u	7 u	505

Increase in the number of Malay novels
= 40% x 3 u
= ⁴⁰₁₀₀ x 3 u
= 1.2 u

Increase in the number of Chinese novels
= ²₇ x 7 u
= 2 u

Total number of novels at first
= 3 u + 7 u + 5 u
= 15 u

15 u = 375

1 u = 375 ÷ 15 = 25

Increase in the number of Malay and Chinese novels
= 1.2 u + 2 u
= 3.2 u
= 3.2 x 25
= 80

Number of English novels brought in
= 130 - 80
= 50 

(b)
Number of English novels at first
= 5 u
= 5 x 25
= 125

Percentage increase in English novels
= ⁵⁰₁₂₅ x 100%
= 40%

Answer(s): (a) 50; (b) 40%