Ten of them.
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There are 19 integers between 1 and 100 containing a 5.
That would be the numbers in the form "32x" (where "x" can be any digit). In other words, ten numbers.
Numbers that have 3 tens range from 30 to 39. This includes all the integers from 30 to 39, which totals 10 numbers: 30, 31, 32, 33, 34, 35, 36, 37, 38, and 39. Therefore, there are 10 numbers that have 3 tens.