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In a box, there are several balls. The pie-chart shows the percentage-wise distribution of 5 different colours of balls; and total number of balls = 1000. Also, the ratio of the light and dark shades of the six colours of balls is given.
Total number of Red balls = 21% of 1000 = 210
Ratio of Light to Dark red balls = 3:4
Number of Dark Red balls = (4/7) * 210 = 120