Mr Poh had $$\frac{3}{4}$$ kg of oil He used $$\frac{2}{3}$$ of it last night. <hr> How much oil did he have left? <br>$$\frac{A}{B}$$ <hr>A: <input min="0" type="number" class="lineinput" placeholder="?" /> B:<input min="0" type="number" class="lineinput" placeholder="?" />