To make pizza dough, Luca mixes $50 \mathrm{~mL}$ of milk for every $250 \mathrm{~mL}$ of flour. How much milk does he mix with $750 \mathrm{~mL}$ of flour?
(A) $100 \mathrm{~mL}$
(B) $125 \mathrm{~mL}$
(C) $150 \mathrm{~mL}$
(D) $200 \mathrm{~mL}$
(E) $250 \mathrm{~mL}$
We divide the $750 \mathrm{~mL}$ of flour into portions of $250 \mathrm{~mL}$. We do this by calculating $750 \div 250=3$. Therefore, $750 \mathrm{~mL}$ is three portions of $250 \mathrm{~mL}$.

Since $50 \mathrm{~mL}$ of milk is required for each $250 \mathrm{~mL}$ of flour, then $3 \times 50=150 \mathrm{~mL}$ of milk is required in total.

ANsWER: (C)