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

Colours	Points
Pink	3
Grey	6
Green	7

In each container, the number of pink marbles was 80% more than the number of green marbles and 30% less than the number of grey marbles. Given that the total possible points if the group managed to collect all the marbles were 6818 points, how many marbles were not pink in colour?

Pink	Grey	Green
9x7		5x7
7x9	10x9
63 u	90 u	35 u

	Pink	Grey	Green	Total
Number	63 u	90 u	35u
Value	3	6	7
Total value	189 u	540 u	245 u	974 u

100% + 80% = 180%
180% = ¹⁸⁰₁₀₀ =⁹₅

100% - 30% = 70%
70% = ⁷⁰₁₀₀ = ⁷₁₀

Total number of points collected
= 189 u + 540 u + 245 u
= 974 u

974 u = 6818

1 u = 6818 ÷ 974 = 7

Number of marbles not pink in colour
= 90 u + 35 u
= 125 u
= 125 x 7
= 875

Answer: 875