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

In the given figure, AQ = 4√2 cm, QC = 6√2 cm and AB = 20 cm. If PQ is parallel to BC, then what is the value of PB (in cm) ?

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

What least number must be subtracted from 518, so that the sum is completely divisible by 13?

If 3a+4b3c+4d = 3a-4b3c-4d, then 

Δ ABC is right angled at B. If m∠A = 60°, then what is the value of sec C.sin A?

Find out the odd word/letters/number/number pair from the given alternatives.

For triangle PQR, find equation of altitude PS if co­-ordinates of P, Q and R are (6,2), (0,3) and (­-4,5) respectively?