Quantitative Aptitude - Arithmetic Ability Questions

If x – y – √18 = –1 and x + y – 3√2 = 1, then what is the value of 12xy(x2 – y2)?

Which of the following triangle has the maximum area when inscribed inside the circle of same radius?

If (6x ­- 5) = (4x + 7), then the numerical value of (x + 1)3  is

Select the odd number from the given alternatives.

The 3rd and 9th term of an arithmetic progression are -8 and 10 respectively. What is the 16th term?

The radii of two concentric circles are 68 cm and 22 cm. The area of the closed figure bounded by the boundaries of the circles is

If 3x^2 + ax + 4 is perectly divisible by x - 5, then the value of a 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?