A store had 225 novels. There were Malay, Chinese and English novels in the ratio of 1 : 6 : 8. When the store assistant brought in another 156 new novels, the number of Malay novels was increased by 40% and the number of Chinese novels was increased by ²₃.

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

	Malay	Chinese	English	Total
Before	1 u	6 u	8 u	225
Change	+ 0.4 u	+ 4 u	+ ?	+ 156
After	1.4 u	10 u	14 u	381

Increase in the number of Malay novels
= 40% x 1 u
= ⁴⁰₁₀₀ x 1 u
= 0.4 u

Increase in the number of Chinese novels
= ²₃ x 6 u
= 4 u

Total number of novels at first
= 1 u + 6 u + 8 u
= 15 u

15 u = 225

1 u = 225 ÷ 15 = 15

Increase in the number of Malay and Chinese novels
= 0.4 u + 4 u
= 4.4 u
= 4.4 x 15
= 66

Number of English novels brought in
= 156 - 66
= 90 

(b)
Number of English novels at first
= 8 u
= 8 x 15
= 120

Percentage increase in English novels
= ⁹⁰₁₂₀ x 100%
= 75%

Answer(s): (a) 90; (b) 75%