MCQ Subject: Number System & Arithmetic

For two numbers, 45 and 60, if their HCF is 15, what is the value of their LCM?

A number when divided by 125 leaves a remainder of 30. What is the least possible value of this number?

Which of the following is a perfect square number?

For two numbers, if their HCF is 12 and LCM is 420, what is the product of the two numbers?

A vehicle covers equal distances at 60 km/h and 40 km/h. What is the average speed for the entire journey?

What can be said about the sum of two even numbers?

If the HCF of two numbers is 5 and their LCM is 120, and if one number is 40, what is the other number?

The HCF and LCM of two numbers are 4 and 60 respectively. If one number is 12, the other number is?

A train departs every 12 minutes, and another train departs every 15 minutes from the same station. How many minutes will it take for both trains to depart at the same time again?

Which number is divisible by 7 according to the rule (double the last digit and subtract from the rest)?