Quantitative Aptitude - Arithmetic Ability Questions

The mean of 100 observations was calculated as 40. It was found later on that one of the observations was misread as 83 instead of 53. The correct mean is:

The area of a triangle with vertices A (0, 8) , O (0,0) and B (5, 0) is:

Common factor of 24b6c8d2, 18a6c2d4, 12a4b4 is

A man spends a part of his monthly income and saves the rest. The ratio of his expenditure to the saving is 61 : 6. If his monthly income is Rs.8710, the amount of his monthly savings is

By increasing the price of entry ticket to a fair in the ratio 7:17, the number of visitors to the fair has decreased in the ratio 9:5. In what ratio has the total collection increased or decreased?

A dealer is selling an article at a discount of 5% on the Marked price. If the Marked price is 12% above the cost price and the article was sold for Rs. 532 then the cost price is (in Rs.)

If P = 350 and Q = 600, then P is how much percentage less than Q?

If 5% of (P + Q) = 20% of (P – Q), then P is what percentage of Q?