In the set of positive integers from 1 to 90, what is the sum of all the odd multiples of 5? Choose the correct choice from the following options.
A) 180
B) 245
C) 320
D) 405
E) 450
reduce 1 - 90   5 - 15 - 25 - 35 - 45--55--65--75--85 are valid multiples. Add them --&gt; 405   405
<result>D</result>
In the set of positive integers from 1 to 90, what is the sum of all the odd multiples of 5?