4 out of 16 × 7 = 7 out of 9 × 21 = 2 out of 5 △ 5 out of 2 = 1 out of 2 × 3 out of 1 × 5 out of 1 = 9 16 × 4 / 7 = 7 / 9 × 2 / 21 = 2 / 5 / 5 / 2 = 1 / 2 × 1 / 3 × 1 / 5 = 2 / 9 × 3 / 2 = 3 / 4 / 3 / 5 = 9 / 3 / 4 =

4 out of 16 × 7 = 7 out of 9 × 21 = 2 out of 5 △ 5 out of 2 = 1 out of 2 × 3 out of 1 × 5 out of 1 = 9 16 × 4 / 7 = 7 / 9 × 2 / 21 = 2 / 5 / 5 / 2 = 1 / 2 × 1 / 3 × 1 / 5 = 2 / 9 × 3 / 2 = 3 / 4 / 3 / 5 = 9 / 3 / 4 =

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