The value of a mobile phone depreciates at the rate of 10% every year. It was purchased 3 years ago. If its present value is Rs. 6561/-, its purchase price was.

The HCF of two numbers is 24. If sum of the numbers is 480, how many such pairs of numbers are possible?

The HCF of two numbers 12906 and 14818 is 478. Their LCM is

The LCM of two numbers is 1920 and their HCF is 16. If one of the numbers is 128, find the other number.

The L.C.M. of two numbers is 1820 and their H.C.F. is 26. If one number is 130 then the other number is:

The LCM of two numbers is 864 and their HCF is 144. If one of the numbers is 288, the other number is:

$${\sqrt{4×?}}={160\over 10}$$

$$\left({?-0.5\over 0.2} \right)={120\over 2}$$