Quantitative Aptitude - Arithmetic Ability Questions

The average weight of Somdev, Gurdeep and Ritu is 85 kg. If the average weight of Somdev and Gurdeep be 79 kg and that of Gurdeep and Ritu be 73 kg, then the weight of Gurdeep is

A student multiplied a number by 6/7 instead of 7/6. What is the percentage error in the calculation?

If Rs. 2,000 is invested at the rate of 20% per annum, compounded half-yearly, then the amount after 18 months will be:

If x2+ x = 19, then what is the value of (x + 5)2+ [1/(x + 5)2]?

P is a point outside the circle at distance of 6.5 cm from centre O of the circle. PR be a secant such that it intersects the circle at Q and R. If PQ = 4.5 cm and QR = 3.5 cm, then what is the radius (in cm) of the circle?

If a-b=1 and a3-b3 = 61, then the value of ab will be

If 9x - [5(2x + 1)/2] = 9/2, then the value of x is?

The price of an article is decreased by 10%. To restore it to its former value, the new price must be increased by