Since 100, 99 & 98 have no sevens we can limit our search to 1 - 97. There will be ten 7's in the ones column and one 7 in the tens column. So it looks like eleven 7's is the answer.
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5.28751 7s equals 37.
6
8
5
10
6
answer:4
14
18
80.
10
13