Principal Mohan Lal and J.C. Nijhawan Solutions for Chapter: Factors and Multiples, Exercise 9: Brain Teasers

Write any two numbers which are divisible by $5$ but not $10$.

Write any two numbers which are divisible by both $4$ and $8$.

Write any two numbers which are divisible by $2,4$ and $8$.

Find the HCF of $1624,522$ and $1276$

Find the LCM of $198,135$,$108$ and $54$.

The HCF and LCM of two numbers are $13$ and $1989$ respectively. If one number is $117,$ find the other?

Can two numbers have $15$ as HCF and $350$ as LCM? Why?

Find the greatest number of four digits which is divisible by $15,20$ and $25$.