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

Colours	Points
Yellow	4
White	7
Blue	10

In each container, the number of yellow balls was 40% more than the number of blue 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 7240 points, how many balls were not yellow in colour?

Yellow	White	Blue
7x3		5x3
3x7	10x7
21 u	70 u	15 u

	Yellow	White	Blue	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 = 7240

1 u = 7240 ÷ 724 = 10

Number of balls not yellow in colour
= 70 u + 15 u
= 85 u
= 85 x 10
= 850

Answer: 850