A rectangular tank 65 cm long, 50 cm wide and 32 cm high is filled with petrol to the brim. Some of the petrol is used. 26 $$l$$ of petrol are left. <hr>The ratio of the volume of petrol used to the volume of petrol left is <input min="0" type="number" id ="imp5pg239q4_1" class="lineinput" placeholder="?" /> : <input min="0" type="number" id ="imp5pg239q4_2" class="lineinput" placeholder="?" />