Quantitative Aptitude - Arithmetic Ability Questions

The median of the numbers 14, 12, 12, 16, 13 and 18 is

The average of 5 members of a family is 24 years. If the youngest member is 8 years old, then what was the average age (in years) of the family at the time of the birth of the youngest member?

A train 110 metres long is running with a speed of 60 kmph . In what time will it pass a man who is running at 6 kmph in the direction opposite to that in which the train is going ?

A product was sold foe Rs. 4,500 at a profit of 12.5%. What was the amount of profit?

A bag contains coins of denominations Rs.1, Rs.5 and Rs.10. Assuming there are equal number of Rs.1, Rs.5 and Rs.10, what will be the total number of coins in the bag be if the total money is Rs. 368?

The marked price of a pen is Rs 3000. The shopkeeper gives two successive discounts of 15% and a% to the customer. If the customer pays Rs 2142 for the pen, then what is the value (in percentage) of a?

If a + b = 1, then a4 + b4 - a3 - b3 - 2a2b2 + ab is equal to

The sum of 2xy(3x + 4y - 5z) and 5yz(2x - 3y) is