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1)

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 :









2)

The H.C.F. of 3666 and 3444 is :









3)

The sum of two numbers is 528 and their H .C.F. is 33. The number of pairs of numbers satisfying the above conditions is :









4)

252 can be expressed as a product of primes as ;









5)

Three numbers which are co-prime to each other are such that the product of the first two is 551 and that of the last two a 1073. The sum of the three numbers is :









6)

Product, of two co-prime numbers is 117. Their L.C.M. should be :









7)

The H.C.F. of 2/3. 8/9. 64/81 and 10/27 is :









8)

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 ?









9)

Which of the following is a pair of co-primes ?









10)

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 ?









11)

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 :









12)

The least rubber which is a perfect square and is divisible bv each of the numbers Jo, 20 and 24, is :









13)

The L.C.M. of 22, 54, 108, 135 and 198 is :









14)

The H.C.F. and L.C.M of two numbers are 11 and 385 respectively. If one number lies between 75 and 125, then that number is :









15)

The H.C.F. of 204, 1190 and 1445 is :