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	3
Brown	6
Grey	9

In each container, the number of red marbles was 40% more than the number of grey marbles and 50% less than the number of brown marbles. Given that the total possible points if the group managed to collect all the marbles were 1200 points, how many marbles were not red in colour?

Red	Brown	Grey
7x1		5x1
1x7	2x7
7 u	14 u	5 u

	Red	Brown	Grey	Total
Number	7 u	14 u	5u
Value	3	6	9
Total value	21 u	84 u	45 u	150 u

100% + 40% = 140%
140% = ¹⁴⁰₁₀₀ =⁷₅

100% - 50% = 50%
50% = ⁵⁰₁₀₀ = ¹₂

Total number of points collected
= 21 u + 84 u + 45 u
= 150 u

150 u = 1200

1 u = 1200 ÷ 150 = 8

Number of marbles not brown in colour
= 7 u + 5 u
= 12 u
= 12 x 8
= 96

Answer: 96