Quantitative Aptitude - Arithmetic Ability Questions

What is the value of (sinA -­ 2sin3A)/(2cos3A -­ cosA)?

Find the value of  x3 - y3, if x - y = 4 and xy = 12.

If ax + by = 1 and bx + ay = 2aba2+b2 then x2+y2a2+b2 is equal to

The value of the expression 2(sin6θ+cos6θ) - 3(sin4θ+cos4θ) + 1 is

The lengths of diagonals of a rhombus are 24cm and 10cm the perimeter of the rhombus (in cm ) is :

D and E are points on side AB and AC of ΔABC. DE is parallel to BC. If AD:DB = 2:5 and area of ΔADE is 8 cm sq, what is the area (in sq cm) of quadrilateral BDEC?

Which of the following is correct?

The mean of the data 1, 2, 10, 18, 3, 17, 19 is