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1)

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 :









2)

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









3)

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









4)

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









5)

252 can be expressed as a product of primes as :









6)

Three different containers contain 496 litres, 403 litres and 713 litres of mixtures of milk and water respectively. What biggest measure can measure all the different quantities exactly ?









7)

The H.C.F. of 1.75, 5.6 and 7 is :









8)

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:









9)

Which of the following has most number of divisors ?









10)

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









11)

The H.C.F. of two numbers is 23 and the other two factors of their L.C.M. are 13 and 14. The larger of the two numbers is :









12)

The LCM of two numbers is 45 times their HCF. If one of the numbers is 125 and the sum of HCF and LCM is 1150, the other number is :









13)

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









14)

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.









15)

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 :