Multiple choice

A sporting goods store ordered an equal number of white and yellow balls. The tennis ball company delivered 45 extra white balls, making the ratio of white balls to yellow balls 1/5 : 1/6. How many white tennis balls did the store originally order for?

  1. 450

  2. 270

  3. 225

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let original number be x. (x + 45) / x = (1/5) / (1/6) = 6/5. 5(x + 45) = 6x. 5x + 225 = 6x. x = 225.

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