How many unique positive odd integers less than 90 are equal to the product of a positive multiple of 5 and an odd number?
Choose one.
A) 4
B) 9
C) 11
D) 12
E) 15
The Question basically asks how many positive odd integers less than 90 are odd multiples of 5   So we have 5,15,25,35,45,55,65,75,85   = 9   Ans 9
<result>B</result>
How many unique positive odd integers less than 90 are equal to the product of a positive multiple of 5 and an odd number?