Quantitative Aptitude - Arithmetic Ability Questions

What is the length of the side of an equilateral triangle, if its area is 64√3 sq cm?

In a triangle PQR, PX, QY and RZ be altitudes intersecting at O. If PO = 6 cm, PX = 8 cm and QO = 4 cm, then what is the value (in cm) of QY?

If cot(A/2) = x, then x is equal to

If cos3A = X, then value of X?

In the following question, select the odd word from the given alternatives.

If price of the table is increased by 25%, then a person can buy 25 table less for Rs 25000. What is the original price (in Rs) of the table?

The simple and compound interest that can be earned in two years at the same rate is Rs 4000 and Rs 4180 respectively. What is the rate (percent per annum) of interest?

The percent profit made when an article is sold for Rs. 78 is twice as much as when it is sold for Rs. 69, the cost price of the article is?