Quantitative Aptitude - Arithmetic Ability Questions

A merchant marks the price of his articles 20% above the cost price. If he allows 20% discount, then what is the profit or loss percentage?

Mr. Murthy invested Rs. 16,000 in a scheme. How much will he get on matuirity, if he invested it at 20% per annum C.I. for 9 months, compounded quarterly?

A plane flies a distance of 1800 km in 5 hours. What is its average speed in meters/second?

Ticket for an adult is Rs 1000 and a child is Rs 500. One child goes free with two adults. If a group has 17 adults and 5 children what is the discount the group gets?

Find the standard deviation of {11, 7, 10,13, 9}

If a : b is 32 : 35 and b : c is 21 : 32, then a : c is?

Three triangles are marked out of a bigger triangle at the three vertices such that each side of each of the smaller triangles is one-third as long as each corresponding side of the bigger triangle. The ratio of the area of the three small triangles taken together to that of the rest of the bigger triangle is ?

If A is 40% more than B, then B is how much percent less than A?