1. Find the greatest number that will divide 43, 91 and 183 so as to leave the remainder in each case.(A) 4(B) 7(C) 13
2. The greatest number of four digits which is divisible by 15, 25, 40 and 75 is :(A) 9400(B) 9000(C) 9600
3. 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) 16
4. The greatest number which on dividing 1657 and 2037 leaves remainders 6 and 5 respectively, is :(A) 127(B) 235(C) 124
5. HCF of 3/16 , 5/ 12 and 7/8 is : (A) 5/48(B) 3/47(C) 1/48
6. Two numbers are in the ratio of 15:11. If their HCF is 13 , find the numbers.(A) 122 and 80(B) 195 and 143(C) none of these
7. Four bells ring simultaneously at starting and an interval of 6 sec, 12 sec, 15 sec and 20 sec respectively. How many times the ring together in 2 hours? (A) 60(B) 120(C) 121
8. Find the sum of two numbers, which are greater than 29 and have HCF and LCM of 29 and 4147 respectively.(A) 858(B) 696(C) 1040
9. The traffic lights at three different road crossings change after every 40 sec, 72 sec and 108 sec respectively. If they change simultaneously at at 5:20 hours, the find the time at which they will change simultaneously.(A) 5 :28:00 hours(B) 5: 30:00 hours(C) 5: 38 :00 hours
10. Four iron metal rods of lenths 78 cm , 104 cm ,117 cm and 169cm are to be cut into parts of equal length. Each part must be as long as possible. What is the maximum number of pieces that can be cut?(A) 27(B) 43(C) 36