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

Colours	Points
Gold	3
Black	6
Blue	7

In each container, the number of gold balls was 40% more than the number of blue balls and 70% less than the number of black balls. Given that the total possible points if the group managed to collect all the balls were 3528 points, how many balls were not gold in colour?

Gold	Black	Blue
7x3		5x3
3x7	10x7
21 u	70 u	15 u

	Gold	Black	Blue	Total
Number	21 u	70 u	15u
Value	3	6	7
Total value	63 u	420 u	105 u	588 u

100% + 40% = 140%
140% = ¹⁴⁰₁₀₀ =⁷₅

100% - 70% = 30%
30% = ³⁰₁₀₀ = ³₁₀

Total number of points collected
= 63 u + 420 u + 105 u
= 588 u

588 u = 3528

1 u = 3528 ÷ 588 = 6

Number of balls not gold in colour
= 70 u + 15 u
= 85 u
= 85 x 6
= 510

Answer: 510