Quantitative Aptitude - Arithmetic Ability Questions

What is the value of sin ­7π/4c?

The reciprocal of the sum of the reciprocals of 2/9 and 7/10 is

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

In an exam, the avarage marks obtained by John in English, Maths, Hindi and Drawing were 50. His average marks in Maths, Science, Social Studies and Craft were 70. If the average marks in all seven subjects is 58, his score in maths was

If two marbles are picked at random, what is the probability that either both are red or both are green?

A mother is five times older than her daughter. After 5 years, she would be 3 times older than her daughter. Find the mother's present age.

From the circumcentre I of the triangle ABC, perpendicular ID is drawn on BC. If ∠BAC = 60°, then the value of ∠BID is

If the shopkeeper sells an item at Rs 1250 which is marked as Rs 1500, then what is the discount he is offering?