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

Colours	Points
Black	2
Yellow	3
Grey	6

In each container, the number of black beads was 60% more than the number of grey beads and 30% less than the number of yellow beads. Given that the total possible points if the group managed to collect all the beads were 5620 points, how many beads were not black in colour?

Black	Yellow	Grey
8x7		5x7
7x8	10x8
56 u	80 u	35 u

	Black	Yellow	Grey	Total
Number	56 u	80 u	35u
Value	2	3	6
Total value	112 u	240 u	210 u	562 u

100% + 60% = 160%
160% = ¹⁶⁰₁₀₀ =⁸₅

100% - 30% = 70%
70% = ⁷⁰₁₀₀ = ⁷₁₀

Total number of points collected
= 112 u + 240 u + 210 u
= 562 u

562 u = 5620

1 u = 5620 ÷ 562 = 10

Number of beads not yellow in colour
= 56 u + 35 u
= 91 u
= 91 x 10
= 910

Answer: 910