What should replace # in this operation?
1#67÷ 2 = 33.5

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A ×
B ÷
C =
D +

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Answer: A. ×

33.5 is 67 / 2, so the expression must work out to 67 / 2. With x, 1 x 67 / 2 = 33.5. With +, division is done first: 1 + 67 / 2 = 1 + 33.5 = 34.5, and with /, 1 / 67 / 2 is far too small.

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What should replace # in this operation? 1#67÷ 2 = 33.5

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What should replace # in this operation?
1#67÷ 2 = 33.5