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
Pink	3
Grey	5
Gold	8

In each container, the number of pink balls was 20% more than the number of gold balls and 10% less than the number of grey balls. Given that the total possible points if the group managed to collect all the balls were 548 points, how many balls were not pink in colour?

Pink	Grey	Gold
6x3		5x3
9x2	10x2
18 u	20 u	15 u

	Pink	Grey	Gold	Total
Number	18 u	20 u	15u
Value	3	5	8
Total value	54 u	100 u	120 u	274 u

100% + 20% = 120%
120% = ¹²⁰₁₀₀ =⁶₅

100% - 10% = 90%
90% = ⁹⁰₁₀₀ = ⁹₁₀

Total number of points collected
= 54 u + 100 u + 120 u
= 274 u

274 u = 548

1 u = 548 ÷ 274 = 2

Number of balls not grey in colour
= 18 u + 15 u
= 33 u
= 33 x 2
= 66

Answer: 66