For a tennis tournament, school ordered an equal number of yellow and white balls. The shop delivere

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10 Jan 2022 Ratio and Proportion

For a tennis tournament, school ordered an equal number of yellow and white balls. The shop delivered 30 extra white balls, making the ratio of yellow balls to white balls 1/11 : 1/9. How many white tennis balls did the school originally order for?

OPtion

1) 165
2) 135
3) 205
4) 190
5) 270
6) 150
7) 145
8) 130
9) 155
10) None of these

Solution

Let the initial quantity of yellow and white balls each be x.
Then, x / (x+30) = (1/11) / (1/9)
Solving, we get x=135

Correct Option: 2 Best Solution (0)