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1)

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 :









2)

Three numbers are in the ratio 1:2:3 and their H.C.F. is 12. 1 he numbers are :









3)

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 :









4)

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









5)

252 can be expressed as a product of primes as ;









6)

H.C.F. of 4 x 27 x 3125, 8 x y x 25 x 7 & 16 x 81 x 5 x 11 x 49 is :









7)

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









8)

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 :









9)

The H.C.F. of two numbers is 11 and their L.C.M. is 7700. If one or the numbers is 275, then the other is :









10)

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









11)

Which of the following has most number of divisors ?









12)

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









13)

The smallest number which when diminished by 7, is divisible by 12. 16, 18, 21 and a is:









14)

A number a is said to be perfect if the sum of all its divisors (excluding n itself) is equal to n. An example of perfect number is :









15)

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 :