Mrs Kumar had some cooking oil.<br>She gave $$\frac{3}{7}$$ of it to her neighbour and used 25% of the remaining oil.<br>She had 150 $$ml$$ of oil left. <hr> How much cooking oil did she have at first? <br> <input min="0" type="number" id ="imp6pg112q8_1" class="lineinput" placeholder="?" />