Two reservoirs are connected by a pipeline consisting of two pipes '$\text{A}$ ' and '$\text{B}$ ' in series. The two pipes are of same length and have the same Darcy friction factor. If the internal diameter of pipe '$\text{B}$ ' is twice as large as the internal diameter of plpe '$\text{A}$ ', the ratio of the head loss in pipe ' $\text{A}$ ' to that in pipe '$\text{B}$ ' is __________ $\text{(answer in integer)}$. Neglect all minor losses.
