15 - 7 = ?, 23 - 9 = ?, 40 - 18 = ?, 56 - 24 = ?, 72 - 35 = ?, 91 - 47 = ?, 104 - 58 = ?, 130 - 76 = ?, 205 - 89 = ?, 300 - 147 = ?.

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