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
White	2
Purple	5
Silver	7

In each container, the number of white marbles was 40% more than the number of silver marbles and 70% less than the number of purple marbles. Given that the total possible points if the group managed to collect all the marbles were 2485 points, how many marbles were not white in colour?

White	Purple	Silver
7x3		5x3
3x7	10x7
21 u	70 u	15 u

	White	Purple	Silver	Total
Number	21 u	70 u	15u
Value	2	5	7
Total value	42 u	350 u	105 u	497 u

100% + 40% = 140%
140% = ¹⁴⁰₁₀₀ =⁷₅

100% - 70% = 30%
30% = ³⁰₁₀₀ = ³₁₀

Total number of points collected
= 42 u + 350 u + 105 u
= 497 u

497 u = 2485

1 u = 2485 ÷ 497 = 5

Number of marbles not white in colour
= 70 u + 15 u
= 85 u
= 85 x 5
= 425

Answer: 425