Quantitative Aptitude - Arithmetic Ability Questions

The mean of marks secured by 45 students in division A of class X is 69, 65 students of division B is 65 and that of 50 students of division C is 63. Find the mean of marks of the students of three divisions of Class X.

The mean of 14 observations is 11. One more observation is included and the new mean becomes 12. The 15th observation is

If 4r = h + r2+h2 then r: h = ? (r not equal to 0)

7 litres mixture of milk and water contains 30% water. 3.5 litres of milk is added to this mixture. What is the percentage of water in the new mixture?

In a Rhombus ABCD, measure of angle CAB is 25°, what is the measure of angle ABC?

In the given figure, ABCD is a square of side 14 cm. E and F are mid points of sides AB and DC respectively. EPF is a semicircle whose diameter is EF. LMNO is a square . What is the area (in sq.cm) of the shaded region?

If 3+12=x+3y, then the x+y is 

Dipali bought a set of cups for Rs. 375, but then had to sell it later to clear old stocks for Rs. 345. What is the percentage of loss that she incurred?