Tank U contains 31 $$l$$ of oil and Tank T, 50 $$l$$. <br> Oil is pumped out of Tank T until it has only 5 $$l$$ more oil than Tank U.<hr> <input min="0" type="number" id ="imp2pg226q3_1" class="lineinput" placeholder="?" /> $$l$$ of oil is taken out of Tank T.