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
Blue	3
Brown	4
Gold	5

In each container, the number of blue marbles was 60% more than the number of gold marbles and 90% less than the number of brown marbles. Given that the total possible points if the group managed to collect all the marbles were 3690 points, how many marbles were not blue in colour?

Blue	Brown	Gold
8x1		5x1
1x8	10x8
8 u	80 u	5 u

	Blue	Brown	Gold	Total
Number	8 u	80 u	5u
Value	3	4	5
Total value	24 u	320 u	25 u	369 u

100% + 60% = 160%
160% = ¹⁶⁰₁₀₀ =⁸₅

100% - 90% = 10%
10% = ¹⁰₁₀₀ = ¹₁₀

Total number of points collected
= 24 u + 320 u + 25 u
= 369 u

369 u = 3690

1 u = 3690 ÷ 369 = 10

Number of marbles not blue in colour
= 80 u + 5 u
= 85 u
= 85 x 10
= 850

Answer: 850