in the set of positive integers from 1 to 70 , what is the sum of all the odd multiples of 5 ?
"reduce 1 - 70 5 - 15 - 25 - 35 - 45 + 55 + 65 are valid multiples 0 f 5 . add them - - > 245 b"
divide(multiply(70, multiply(const_3, 5)), 5)