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
Red	2
Yellow	3
Green	6

In each container, the number of red marbles was 20% more than the number of green marbles and 10% less than the number of yellow marbles. Given that the total possible points if the group managed to collect all the marbles were 1674 points, how many marbles were not red in colour?

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

	Red	Yellow	Green	Total
Number	18 u	20 u	15u
Value	2	3	6
Total value	36 u	60 u	90 u	186 u

100% + 20% = 120%
120% = ¹²⁰₁₀₀ =⁶₅

100% - 10% = 90%
90% = ⁹⁰₁₀₀ = ⁹₁₀

Total number of points collected
= 36 u + 60 u + 90 u
= 186 u

186 u = 1674

1 u = 1674 ÷ 186 = 9

Number of marbles not yellow in colour
= 18 u + 15 u
= 33 u
= 33 x 9
= 297

Answer: 297