Quantitative Aptitude - Arithmetic Ability Questions

The mean of 12 observations is 15. One more observation is included and the new mean becomes 16. The 13th observation is

Of the 3 numbers whose average is 40, the first is 1/3 rd the sum of other 2. What is the first number?

D and E are points on side AB and AC of ΔABC. DE is parallel to BC. If AD:DB = 2:3 and area of ΔADE is 4 sq cm, what is the area (in sq cm) of quadrilateral BDEC.

PQRA is a rectangle, AP = 22 cm, PQ = 8 cm. ΔABC is a triangle whose vertices lie on the sides of PQRA such that BQ = 2 cm and QC = 16 cm .Then the length of the line joining the mid points of the sides AB and BC is

If 5/6th of 7/6th of a number is 140, then 9/4th of that number is

46% of 250 is equal to

Find co-ordinates of the mid point of the segment joining points C (3,-5) and D (-7,3).

If the shopkeeper sells an item at Rs 450 which is marked as Rs 600, then what is the discount he is offering?