Find the value of 'x' that satisfies the equation: √(136 + √(57 + √x)) = 12

The value of × satisfying the equations 1/x + 1/y = 8, 1/y+1/z = 12, 1/z +1/x = 10 is

Find the value of x, if 3⁴ × 3ˣ = 3⁸:

What will be the value of the equation: (2.4 × 0.72 × 4.5) / (0.18 × 0.06 × 0.9) × 3?

For what value of k does the system of equations x - ky = 2 and 3x + 2y = -5 NOT have a unique solution?

If a, b, c, d, e and f satisfy 2a = 3b = 6c = 9d = 12e = 18f, then what is the value of (a + b)/(c + d + e + f)?