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

Colours	Points
Purple	2
Silver	3
Red	5

In each container, the number of purple marbles was 20% more than the number of red marbles and 70% less than the number of silver marbles. Given that the total possible points if the group managed to collect all the marbles were 873 points, how many marbles were not purple in colour?

Purple	Silver	Red
6x1		5x1
3x2	10x2
6 u	20 u	5 u

	Purple	Silver	Red	Total
Number	6 u	20 u	5u
Value	2	3	5
Total value	12 u	60 u	25 u	97 u

100% + 20% = 120%
120% = ¹²⁰₁₀₀ =⁶₅

100% - 70% = 30%
30% = ³⁰₁₀₀ = ³₁₀

Total number of points collected
= 12 u + 60 u + 25 u
= 97 u

97 u = 873

1 u = 873 ÷ 97 = 9

Number of marbles not purple in colour
= 20 u + 5 u
= 25 u
= 25 x 9
= 225

Answer: 225