David W. answered 06/27/18
Tutor
4.7
(90)
Experienced Prof
"a multiple of 5" means that the number has a factor of 5
That is, 5*x
"a factor of six" means that the number has factor of 6.
That is, 6*y
So far, this is 5*6*z <100
Here are the possibilities:
value of z number factors
------------ -------- ---------
1 30 5*6
2 60 5*6*2
3 90 5*6*3