Solution
53 * 13 = 33
53. + 13 = $$\frac{66}{2}$$
, 39 * 13 = 26
39. + 13 = $$\frac{42}{2}$$ = 26
74 * 26 = 50,
74. + 26 = $$\frac{100}{2}$$ =
37 * 21
37. + 21 = $$\frac{58}{2}$$ =29
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