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	2
Black	3
Yellow	4

In each container, the number of silver marbles was 40% more than the number of yellow marbles and 70% less than the number of black marbles. Given that the total possible points if the group managed to collect all the marbles were 624 points, how many marbles were not silver in colour?

Silver	Black	Yellow
7x3		5x3
3x7	10x7
21 u	70 u	15 u

	Silver	Black	Yellow	Total
Number	21 u	70 u	15u
Value	2	3	4
Total value	42 u	210 u	60 u	312 u

100% + 40% = 140%
140% = ¹⁴⁰₁₀₀ =⁷₅

100% - 70% = 30%
30% = ³⁰₁₀₀ = ³₁₀

Total number of points collected
= 42 u + 210 u + 60 u
= 312 u

312 u = 624

1 u = 624 ÷ 312 = 2

Number of marbles not black in colour
= 21 u + 15 u
= 36 u
= 36 x 2
= 72

Answer: 72