Quantitative Aptitude - Arithmetic Ability Questions

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

The perimeters of a square and an equilateral triangle are equal. If the diagonal of the square is 9 cm, what is the area of the equilateral triangle?

Square of (3x – 5xy) is

x and y are two numbers such that their mean proportion is 8 and third proportion is 512. What is the value of x and y?

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

The marked price of a book is Rs 4200. The shopkeeper gives two successive discounts of 25% and y% to the customer. If the customer pays Rs 2898 for the book, then what is the value (in percentage) of y?

If SinX-CosX=1, where 'X' is an acute angle, the value of SinX+CosX is

Select the odd number from the given alternatives.