Question
X can work as fast as Y and Z together. X and Y together
can finish the same task 3 times as fast as Z. If all three working together can finish the task in 18 days, how many days, will Z take to finish the task?Solution
Let the number of days it takes. X to finish the task be x Y to finish the task be y Z to finish the task be z Therefore, as per the given relations 
 By adding the first two equations, we get 
Find the least number of four digits which is exactly divisible by 5, 15 and 25?
- Find the least common multiple of (25/35), (10/14), and (30/42).
Find the greatest number of 4 digits divisible by 15, 25, 40 and 75.
Find the difference between sum of digits of LCM and HCF of 32, 48 and 80.
The ratio of two numbers is 10:12 and their LCM is 240. The numbers are:
Three numbers are in the ratio 5:3:2 respectively. If the HCF of the numbers is 4, then find the LCM of the numbers.
The least number which when divided by 9, 12, 15, 18, and 21 leaves the same remainder 7 in each case, is:
Sum of the two numbers is 32 and their HCF and LCM are 4 and 60, respectively. Find the sum of reciprocal of the given two numbers.
Four runners started running simultaneously from a point on a circular track. They took 400 seconds, 600 seconds, 720 seconds and 900 seconds to comple...
Three boys step off together from the same spot. Their steps measure 64 cm, 80 cm and 88 cm respectively. The minimum distance each should cover so that...
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