1 252 can be expressed as a product of primes as ; A) 2x2x3x3x7 B) 2x2x2x3x7 C) 3x3x3x3x7 D) 2x3x3x3x7
5 Three numbers are in the ratio 1:2:3 and their H.C.F. is 12. The numbers are : A) 4, 8, 12 B) 5, 10, 15 C) 10, 20, 30 D) 12. 24. 36
6 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 : A) 4 B) 6 C) 8 D) 12
7 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 : A) 71 B) 81 C) 85 D) 89
8 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 : A) 279 B) 283 C) 308 D) 318
9 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 : A) 215 B) 220 C) 225 D) 235
10 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 ? A) 1 litres B) 7 litres C) 31 litres D) 41 litres
11 The maximum number of students among them 1001 pens and 910 pencils can be distributed in such a way that each student gets the same number of pens and same number of pencils is : A) 91 B) 910 C) 1001 D) 1911
12 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 : A) 4 B) 5 C) 6 D) 8
13 The least number which is a perfect square and is divisible by each of the numbers 10, 20 and 24, is A) 1600 B) 3600 C) 6400 D) 14400
14 The smallest number which when diminished by 7, is divisible by 12, 16, 18 and 21 ?. A) 1008 B) 1015 C) 1022 D) 1032
15 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 ? A) 4 B) 10 C) 15 D) 16
