Question
A can complete a piece of work in 18 days. B can
complete the same work in 72 days. While C is 33(1/3)Â more efficient than B. All three started working together. A left 8 days before the work was completed, and C left 17 days before but B continued to work till the end, for how many days did A work?Solution
Given C is 33.33% is more efficient than B. 
But A left before 8 days = 18-8 = 10 Days So A worked only 10 Days.
What will be the greatest common divisor (GCD) of (x² - 6x + 8) and (x² - 9x + 20).
Let N be the greatest number that will divide 85, 116, 147 leaving the same remainder in each case. Then sum of the digits in N is:
Find the HCF and LCM of 24, 36 and 60.
What is the HCF of 4/5, 6/8, 8/25 ?
A boy can swim in still water at a speed of 8 km/hr. If the speed of the current would have been 3 km/hr, then the boy could swim 55 km
Ratio of two numbers 10:21 and their LCM is 2520. Find the sum of the given two numbers.
The least number which when divided by 4, 6, 10 and 12 leave zero remainder in each case and when divided by 13 leaves a remainder of 8 is:
- The product of two numbers is 5600 and their L.C.M is 280. What is the H.C.F of the two numbers?
What is the difference between the LCM and HCF of 36, 40?
