I think the joke is that 3 out of 4 of the answers could be correct because "by half" is not clear.
Divide 50 by half of 50 (50 / 25) + 20 = 22
Divide 50 in half (50 / 2) + 20 = 45
Divide 50 by half of one (50 / 0.5) + 20 = 120
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I think the joke is that 3 out of 4 of the answers could be correct because "by half" is not clear.
Divide 50 by half of 50 (50 / 25) + 20 = 22
Divide 50 in half (50 / 2) + 20 = 45
Divide 50 by half of one (50 / 0.5) + 20 = 120