The total number of 2-digit numbers that are multiples of either 5 or 7 is 27
How many multiples of 5 are there?
The multiples of 5 end on 0 or 5, so we have:
10, 15, 20, 25,..., 95
A total of 17 numbers of 2 digits are multiples of 5.
How many multiples of 7 are there?
7*2 = 14
7*14 = 98
So there are 14 - 2 = 12 multiples of 7 in the range.
Such that:
7*5 = 35
7*10 = 70
So there are 2 common multiples of 5 and 7.
Then the total number of 2-digit numbers that are multiples of either 5 or 7 is:
17 + 12 - 2 = 27
If you want to learn more about multiples:
https://brainly.com/question/10749076
#SPJ2
