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

Colours	Points
Gold	4
White	7
Black	10

In each container, the number of gold balls was 40% more than the number of black balls and 70% less than the number of white balls. Given that the total possible points if the group managed to collect all the balls were 5068 points, how many balls were not gold in colour?

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

	Gold	White	Black	Total
Number	21 u	70 u	15u
Value	4	7	10
Total value	84 u	490 u	150 u	724 u

100% + 40% = 140%
140% = ¹⁴⁰₁₀₀ =⁷₅

100% - 70% = 30%
30% = ³⁰₁₀₀ = ³₁₀

Total number of points collected
= 84 u + 490 u + 150 u
= 724 u

724 u = 5068

1 u = 5068 ÷ 724 = 7

Number of balls not white in colour
= 21 u + 15 u
= 36 u
= 36 x 7
= 252

Answer: 252