Tank W contains 90 $$l$$ of oil and Tank X, 140 $$l$$. Oil is pumped out of Tank W until Tank X has 100 $$l$$ more oil than Tank X. <hr> <input min="0" type="number" id ="imp2pg226q4_1" class="lineinput" placeholder="?" /> $$l$$ of oil is pumped out of Tank W.