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
Yellow	2
Grey	3
Silver	5

In each container, the number of yellow beads was 20% more than the number of silver beads and 70% less than the number of grey beads. Given that the total possible points if the group managed to collect all the beads were 970 points, how many beads were not yellow in colour?

Yellow	Grey	Silver
6x1		5x1
3x2	10x2
6 u	20 u	5 u

	Yellow	Grey	Silver	Total
Number	6 u	20 u	5u
Value	2	3	5
Total value	12 u	60 u	25 u	97 u

100% + 20% = 120%
120% = ¹²⁰₁₀₀ =⁶₅

100% - 70% = 30%
30% = ³⁰₁₀₀ = ³₁₀

Total number of points collected
= 12 u + 60 u + 25 u
= 97 u

97 u = 970

1 u = 970 ÷ 97 = 10

Number of beads not yellow in colour
= 20 u + 5 u
= 25 u
= 25 x 10
= 250

Answer: 250