Question 1 :
Find the least 5-digit number which is exactly divisible by $20, 25, 30$.

Question 7 :
Number of students who have opted for the subjects A, B and C are $60,84$ and $108$ respectively. The examination is to be conducted for these students such that only the students of the same subject are allowed in one room. Also the number of students in each room must be same. What is the minimum number of rooms that should be arranged to meet all these conditions?

Question 10 :
Every ........ number can be expressed as a product of prime numbers.

Question 15 :
A leap of coconuts is divided into groups of 2,3 and 5 and each time one coconut is left over.The least number of coconuts in the leap is

Question 18 :
What is the least number which when divided by $7, 9$ and $12$, leaves the same remainder $1$ in each case?

Question 20 :
Which one of the following numbers is completely divisible by $45$?