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
Silver	3
Black	5
Purple	8

In each container, the number of silver marbles was 80% more than the number of purple marbles and 50% less than the number of black marbles. Given that the total possible points if the group managed to collect all the marbles were 314 points, how many marbles were not silver in colour?

Silver	Black	Purple
9x1		5x1
1x9	2x9
9 u	18 u	5 u

	Silver	Black	Purple	Total
Number	9 u	18 u	5u
Value	3	5	8
Total value	27 u	90 u	40 u	157 u

100% + 80% = 180%
180% = ¹⁸⁰₁₀₀ =⁹₅

100% - 50% = 50%
50% = ⁵⁰₁₀₀ = ¹₂

Total number of points collected
= 27 u + 90 u + 40 u
= 157 u

157 u = 314

1 u = 314 ÷ 157 = 2

Number of marbles not black in colour
= 9 u + 5 u
= 14 u
= 14 x 2
= 28

Answer: 28