Four machine makes a beep after every 1, 3, 5 and2 min respectively . In 5hrs , how many times do they beep together if they have just beeped together.

LCM of 1, 3, 5 and 2 = 30 That means after 30 min they will beep again together. 30 min = 30/60 hrs = 1/2 [endif]-->hrs Then number of beep in 5hrs = (5 × 2)/1 = 10 times

- LCM and HCF of the two numbers are 225 and 15 respectively. One of the numbers is 45, then find the second number.
- The greatest number of four digits which when divided by 5, 7, 9 leave remainders 3, 5, 7 respectively is:
- The sum of two numbers is 104 and their HCF is 13. Total number of such pairs of numbers is?
- A number is three times another number and their HCF is 8. What is the sum of the squares of the numbers?
- The HCF and LCM of two consecutive even number is 2 and 112 respectively. Find the sum of reciprocal of these two numbers?
- Find the greatest number which when divide 33,55 & 77 leave a same remainder in each case?
- The sum of two numbers is 156 and their HCF is 26. Find how many such pairs can be formed.
- The HCF of a^6 - 1 and a^4+ 2a^3- 2a-1 is
- If HCF of two numbers is 11 then which of the following can never be their LCM?
- Sum of the two numbers is 42. LCM and HCF of that two number is 72 and 6 respectively. Find the sum of reciprocals of the numbers?

More HCF and LCM Questions

×

×