If the product of two numbers is 84942 and their H.C.F. is 33, find their L.C.M. A. 2500 B. 2574 C. 1574 D. 1365 Answer Workspace Report Discuss Answer with explanation Answer: Option B Explanation Explanation: HCF * LCM = 84942, because we know Product of two numbers = Product of HCF and LCM LCM = 84942/33 = 2574 Workspace
What will be the least number which when doubled will be exactly divisible by 12, 18, 21 and 30 ? A. 196 B. 1260 C. 630 D. 2520 Answer Workspace Report Discuss Answer with explanation Answer: Option C Explanation 12 = 2 × 2 × 3 18 = 2 × 3 × 3 21 = 3 × 7 30 = 2 × 3 × 5 L.C.M. of 12, 18, 21 30 = 2 × 3 × 2 × 3 × 7 × 5 = 1260 Required number = 1260/2 = 630 Workspace
The H.C.F and L.C.M of two numbers are 50 and 250 respectively. If the first number is divided by 2, the qotient is 50. The second number is A. 50 B. 100 C. 125 D. 75 Answer Workspace Report Discuss Answer with explanation Answer: Option C Explanation as we know if two numbers say a and b are multiplied the product is equal to the product of their HCF and LCM so A.T.Q a/2=50 a=100 therefore hcf(100,b)*lcm(100,b)=100b 50*250=100b 12500/100=b 125=b the second no. is 125 Workspace
The H.C.F. of 2/3, 8/9, 64/81, 10/27 is A. 2/81 B. 160/81 C. 160/3 D. 2/3 Answer Workspace Report Discuss Answer with explanation Answer: Option A Explanation Workspace
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. 15 C. 10 D. 16 Answer Workspace Report Discuss Answer with explanation Answer: Option D Explanation Workspace
