25 tenths.
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There are five tenths in a half. 5/10 = 1/2
7 1/2 = 7 + 1/2 = 7 + 0.5 = 7.5 (5 tenths) * * * * * I suspect that the question was about how many tenths in the whole of seven and a half. That is, 7.5/(1/10). And the answer to that , is 75
Fifteen 1 and a half = 3/2 3/2 x 5/5 = 15/10
25 of them because 25/10 equals 2 and 1/2
Five one tenths make one half. 5*(1/10) = 0.5 = 1/2