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The groups have 6, 9 and 12 tennis balls

Consider how many parts there are:

in ratio of 2 : 3 : 4 there are 2 + 3 + 4 = 9 parts.

With 27 tennis balls, each part is worth 27 ÷ 9 = 3 tennis balls.

Thus, in the first group there are 2 parts = 2 x 3 = 6 tennis balls,

in the second group there are 3 parts = 3 x 3 = 9 tennis balls,

and in the third group there are 4 parts = 4 x 3 = 12 tennis balls.

To check: 6 + 9 + 12 = 27

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13y ago

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