3 : 4, Ratio of white tennis balls to orange tennis balls, 7 : 4, Ratio of the total number of tennis balls to orange tennis balls, 4 : 3, Ratio of orange tennis balls to white tennis balls, 3 : 7, Ratio of white tennis balls to the total number of tennis balls, 1 : 7, Wrong choice a, 3 : 10, Wrong choice  b.

ratio practice

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