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
Green	3
Yellow	4
Brown	5

In each container, the number of green balls was 20% more than the number of brown balls and 10% less than the number of yellow balls. Given that the total possible points if the group managed to collect all the balls were 836 points, how many balls were not green in colour?

Green	Yellow	Brown
6x3		5x3
9x2	10x2
18 u	20 u	15 u

	Green	Yellow	Brown	Total
Number	18 u	20 u	15u
Value	3	4	5
Total value	54 u	80 u	75 u	209 u

100% + 20% = 120%
120% = ¹²⁰₁₀₀ =⁶₅

100% - 10% = 90%
90% = ⁹⁰₁₀₀ = ⁹₁₀

Total number of points collected
= 54 u + 80 u + 75 u
= 209 u

209 u = 836

1 u = 836 ÷ 209 = 4

Number of balls not yellow in colour
= 18 u + 15 u
= 33 u
= 33 x 4
= 132

Answer: 132