Question

how many multiplies of 3 are in all 2 digit numbers

Answer 1

there are 30 multiples of 3 in all 2 digit number.
12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81,84,87,90,93,96,99.