Q: If the integer a is a multiple of 6, the integer b is a multiple of 3, and a>b>0, then which of the following integers must be a2 – b2 multiple of?
Q: If 6 men can complete a work in 15 hours. Then 10 men, working on the same speed, will complete the same work in _________ hours.
Q: The ages of A, B and C are 17, 16 and 12 respectively. If the age of D also included the average of the ages is increased by 5. What is the age of D?
Q: Machine P can print one lakh books in 8 hours. Machine Q can print the same number of books in 10 hours while machine R can print the same in 12 hours. All the machines started printing at 9 A.M. Machine P is stopped at 11 A.M. and the remaining two machines complete work. Approximately at what time will the printing of one lakh books be completed?
Q: The sum of all prime numbers between 60 and 90 is: