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252 can be expressed as a product of primes as :
A, B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 2.ri2 seconds, B in 308 seconds and C in 198 seconds, all starting at the same point. After what time will they meet again at the starting noint ?
Four different electronic devices make a beep after every 30 minutes, 1 hour, 1.5 hour
and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at :
Six bells commence tolling together and toll at intervals of 2, 4, 6, 8, 10 and 12 seconds respectively. In 30 minutes, how many times do they toll together ?
Find the least number which when divided by 16, 18; 20 and 25 leaves 4 as remainder in each case, but when divided by 7 leaves no remainder.
The smallest number which when diminished by 7, is divisible by 12. 16, 18, 21 and a is:
Let the least number of six digits, which when divided by 4, 6, 10 and 15 leaves in each case the same remainder of 2, be N. The sum of the digits in N is :
The least rubber which is a perfect square and is divisible bv each of the numbers Jo, 20 and 24, is :
The least number of five digits which is exactly divisible by 12, 15 and 18, is :
Let N be the greatest number that will divide 1305, 4665 and 6905, leaving the same remainder in each case Then sum of the digits in N is :