The LCM of two numbers is 495 & their HCF is 5 .If the sum of the no. is 100 then find their difference .

The smallest no. which is divisible by 12,15,20 and is a perfect square.

Find the least no. of square tiles required for  terrace 15 m long & 9 m broad.

The HCF of two no. is 23 and the other two factors of their LCM are 13 and 14 . Find the larger  of two number.

Find the greatest  possible length which can be used to measure exactly the length 7 m,3 m 85 cm & 12 m 95 cm.

Find the greatest number which can  divide 1356 ,  1868 and 2764 leaving the same remainder 12 in each case.

Find the least numbers which should be added to 2497 so that the sum is exactly divisible by 5, 6, 4  & 3 .

Find largest five digit number which when divided by 4,7 or 13 leaves a remainders 3  in each case .

Six bells commence tolling together and toll at intervals of 2, 4, 6, 10 & 12 second respectively .in 20 minutes how many times do they toll together.

The total numbers of prime factors of product  

  8²⁰ ,15²⁴ & 7¹⁵ .