If a certain number of labours can dig earth 100 m deep 25 m long and 30 m broad in 12 days , then find the number of days the same number of labours, will required to dig each 75 m deep , 20m long and 50 m broad

Question

$\begin{array}{1 1} 12 \\ 18 \\ 6 \\ 1 \end{array} $