In a party, 60% of the invited guests are male and 40% are female. If 80% of the invited guests attended the party and if all the invited female guests attended, what would be the ratio of males to females among the attendees in the party?

The differential of the equation, $x^2 + y^2 = 1$, with respect to $x$ is

If $[A][B] = [I]$ then

$\textit{Sinh }(x)$ is

Parallel holes at right angles to the face with some holes uncharged are associated with the following shot hole pattern

Bieniawski's Rock Mass Rating considers the parameters: RQD, spacing of joints, condition of joints, ground water condition, and

A longwall panel of width 120 m is extracted at a depth of 200 m. Critical subsidence is reached when the panel length becomes 150 m. If the seam were to be worked at a depth of 300 m, critical subsidence would be observed at a panel length, in m, of ______.

The support system followed along the goaf edge in a depillaring panel is

Which one of the following ropes CANNOT be an effective cable bolt?

Out of the support categories given for an underground coal mine, identify the ‘active support’.