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What is the number of three-digit multiples of 5 that are not divisible by 10?
a) 90
b) 100
c) 180
d) 200
e) 1000
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In all, there are 999 - 99 = 900 three-digit numbers.
The number of those three-digit numbers that are multiples of 5, is 
= 180.
Half of them are multiple of 10, i.e. 
= 90.
The other half are those three-digit integers that are multiples of 5, but not multiples of 10.
Answer. There are 90 three-digit integers that are multiples of 5, but not multiples of 10. Option A)
