A sporting goods store ordered an equal number of white and yellow tennis balls. The tennis ball company delivered 30 extra white balls, making the ratio of white balls to yellow balls 6:5. How many tennis balls did the store originally order? Select: A) 120 B) 150 C) 180 D) 300 E) 330
(X+30)/(X)= 6/5   Cross multiply: 5X + 150 = 6X   X = 150   And since we originally ordered 2X balls the answer is 300.300
<result>D</result>
A sporting goods store ordered an equal number of white and yellow tennis balls. The tennis ball company delivered 30 extra white balls, making the ratio of white balls to yellow balls 6:5. How many tennis balls did the store originally order?