How many unique positive odd integers less than 80 are equal to the product of a positive multiple of 5 and an odd number?
Pick
A) 4  B) 8  C) 11  D) 12  E) 15
The Question basically asks how many positive odd integers less than 80 are odd multiples of 5   So we have 5,15,25,35,45,55, 65,75   =8   8
<result>B</result>
How many unique positive odd integers less than 80 are equal to the product of a positive multiple of 5 and an odd number?