During a telematch, each group of pupils was supposed to collect as many coloured balls as possible. Each colour represented a certain point as tabulated:

Colours	Points
Red	3
Black	4
Brown	5

In each container, the number of red balls was 60% more than the number of brown balls and 30% less than the number of black balls. Given that the total possible points if the group managed to collect all the balls were 4641 points, how many balls were not red in colour?

Red	Black	Brown
8x7		5x7
7x8	10x8
56 u	80 u	35 u

	Red	Black	Brown	Total
Number	56 u	80 u	35u
Value	3	4	5
Total value	168 u	320 u	175 u	663 u

100% + 60% = 160%
160% = ¹⁶⁰₁₀₀ =⁸₅

100% - 30% = 70%
70% = ⁷⁰₁₀₀ = ⁷₁₀

Total number of points collected
= 168 u + 320 u + 175 u
= 663 u

663 u = 4641

1 u = 4641 ÷ 663 = 7

Number of balls not black in colour
= 56 u + 35 u
= 91 u
= 91 x 7
= 637

Answer: 637