How many of the 101 natural numbers from 0 to 100 can be divided by 5 or 7?

How many of the 101 natural numbers from 0 to 100 can be divided by 5 or 7?


Number 21 divisible by 5
Number 15 divisible by 7
It can be divided by 5 and 7 at the same time, that is, the multiple of 35 is 3
Gong 21 + 15-3 = 33



Every digit of a natural number is 0 or 2, and can be divided by 225 to find the minimum natural number satisfying the condition


225=25×9
So at least two zeros in the end
It's going to be a multiple of nine, so
There must be 9 2
Minimum = 22200