Quantitative Aptitude - Arithmetic Ability Questions

The mean of marks secured by 65 students in division A of class X is 54, 30 students of division B is 50 and that of 55 students of division C is 48. Find the mean of marks of the students of three divisions of Class X.

A table tennis player, lost 12 games out of 18 games played. Calculate the games won in terms of decimal.

25% discount is offered on an item. By applying a promo code the customer wins 8% cash back. What is the effective discount?

Two numbers are 35% and 50% lesser than a third number. By how much percent is the second number to be enhanced to make it equal to the first number? 

If 1/2 is added to a number and the sum is multipled by 3, the result is 21. Then the number is

Point Q(-1,b) is the midpoint of segment EF. Co-ordinates of point E are (-4,a) and point F are (2,0). What is the value of a and b?

A solid cube has side 8 cm. It is cut along diagonals of top face to get 4 equal parts. What is the total surface area (in cm2) of each part?

A, B and C can finish a job working alone in 12, 8 and 24 days respectively. In how many days they can finish the job if they worked together?