Quantitative Aptitude - Arithmetic Ability Questions

Average age of 6 boys is 14 years. Average age of 11 girls is 12 years. What is the average age (in years) of all boys and girls?

Which of the numbers given below is the square root of 15376?

Car B is twice as fast as car A. If car A covers 90 km in 2 hours, what is the speed of car B?

The traffic lights at four different road crossings change after every 15 sec, 18 sec, 27 sec and 30 sec respectively. If they all change simultaneously at 6:10:00 hours, then at what time will they again change simultaneously?

Find the number that is as much greater than 39 as is less than 79.

If the number x3331 is divisible by 11, what is the face value of x?

Slit 69 into three parts such that they are in A.P. and the product of their smaller parts is 483.