Question
If 65 + 54 = 2, 71 + 62 = 10, then 73 + 83 =
?Solution
6 – 5 = 1, 5 – 4 = 1 ⇒ 1 + 1 = 2 7 – 1 = 6, 6 – 2 = 4, ⇒ 6 + 4 = 10 7 – 3 = 4, 8 – 3 = 5 ⇒ 4 + 5 = 9
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