A basket contain green, black and blue balls in the ratio 5 : 2 : 1. If there are 10 blue balls. Find the corresponding new ratio when 10 green and 10 black balls are removed from the basket

A.
1 : 1 : 1 
B.
4 : 2 : 1 
C.
5 : 1 : 1 
D.
4 : 1 : 1
Correct Answer: Option D
Explanation
Let x represent total number of balls in the basket.
If there are 10 blue balls, (frac{1}{8}) of x = 10
x = 10 x 8 = 80 balls
Green balls will be (frac{5}{8}) x 80 = 50 and black balls = (frac{2}{8}) x 80 = 20
Ratio = Green : black : blue
50 : 20 : 10
10 : 10 : –
———
New Ratio 40 : 10 : 10
4 : 1 : 1