15 multiplied by 22/9 = 36 2/3
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15
22 times, with 4 left over.
8/15 x 9/4 = 1 1/5
8/9 × 15/28 × 21/25 = (8×15×21)/(9×28×25) = 2520/6300 = (2×1260)/(5×1260) = 2/5
4/15 * 9/5 = 4/5 * 3/5 = 12/25