Hi,

green, black and blue balls in the ratio 5:2:1

Basket originally contains 8x balls: 5x green, 2x black and x blue

If there are 10 blue balls (x = 10)

Basket originally contains 80 balls: 50 green, 20 black and 10 blue

10 green and 10 black balls are removed

Then

Basket originally contains 60 balls: 40 green, 10 black and 10 blue

and ratio is: 4:1:1 

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