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
Brown	3
White	5
Black	7

In each container, the number of brown beads was 60% more than the number of black beads and 50% less than the number of white beads. Given that the total possible points if the group managed to collect all the beads were 1390 points, how many beads were not brown in colour?

Brown	White	Black
8x1		5x1
1x8	2x8
8 u	16 u	5 u

	Brown	White	Black	Total
Number	8 u	16 u	5u
Value	3	5	7
Total value	24 u	80 u	35 u	139 u

100% + 60% = 160%
160% = ¹⁶⁰₁₀₀ =⁸₅

100% - 50% = 50%
50% = ⁵⁰₁₀₀ = ¹₂

Total number of points collected
= 24 u + 80 u + 35 u
= 139 u

139 u = 1390

1 u = 1390 ÷ 139 = 10

Number of beads not brown in colour
= 16 u + 5 u
= 21 u
= 21 x 10
= 210

Answer: 210