A sports-goods shop has tennis balls of 3 colors - red, green and white. The number of white balls is 60% more than number of red balls and the number of green balls is 12.5% less than number of white balls. If total number of balls is 120, then how many green balls are there ?
Answer & explanation
Correct answer: option 3
Let the number of red balls be 5
Then, white balls = \(\frac{8}{5}\) x 5 = 8
(because 60% more = \(\frac{160}{100}\) = \(\frac{8}{5}\) )
green balls = \(\frac{7}{8}\) x 8 = 7
(because 12.5% less = \(\frac{87.5}{100}\) = \(\frac{7}{8}\) )
Red : White : Green
Ratio = 5 : 8 : 7 ⇒ total = 20R
Given, 20R = 120
R = 6
No. of green balls = 7R = 42