54% of 250 = 6 × 21 +

If (2x + 3y+ 4) (2x + 3y 5) is equivalent to (ax² + by² + 2hxy + 2gx + 2fy + c), then what is the value - of ((g + f – c) / abh}?

If a³ = 117 + b³ and a = 3 + b, then the value of a + b is:

If x1x2x3 = 4(4 + x1 + x2 + x3), then what is the value of [1/(2 + x1)] + [1/(2 + x2)] + [1/(2 + x3)]?

The value of = 3/4 ÷ 3/4  of 4/3 + 5/2 ÷ 2/5 of 5/4 – (2/3 + 2/3 of 5/6) is :

Find x, given 5 (√5)^x+6 = (√5)^2x+7 :

If 2y cos θ  = x sin θ  and 2x sec θ -  y cosec θ  = 3, then the value of x²+ 4y² is

Determine the remainder when equation 4a³ - 5a² + 2a + 1 is divided by (4a - 3) . 

If x + y = 7 and xy = 10, then the value of (1/x³ + 1/x³) is :

Solve the cubic equation, x³ − 7x² + 14x − 8 = 0 and Find all real roots.

There are 6 blue pens, 5 black pens and 4 green pens in a bag. Three pens are chosen randomly.