Who among the following is ex-officio chairman of

If x + y = 4 and (1/x) + (1/y) = 24/7, then the value of (x³ + y³).

If 125x³ - 216y³ = (5x - Ay) X (Bx² + 36y² + Cxy), then find the value of 3 X (2A + 6B) - 2C.

Calculate the value of the expression: {2 X (P³ - Q³) - 30 X P X Q} if (P - Q) = 6 and (P² + Q²) = 80

If ( m+n  ) : √ (mn) = 4, m>n  , Then find the value of m : n ?

If (a + b) = 13 and ab = 18, find the value of (a² + b²).

If 10% of 24% of x is 240, then x = ?

If x⁴ + x³ + x² + x + 1 = 0, then find the value of x¹⁵²⁵ + x⁷²⁰ + 14 + x³²⁰ =?