What is the sum of all the divisors of 90?

Double of the common factors of two co-prime numbers is _______.

Select the correct statement.

A number is divided by 25 to get quotient 26 and remainder 2 if the same number is divided by 30 then what is the quotient and remainder respectively?

By how much more or less is the number of divisors of 60 to that of the divisors of 75?