Jenny cuts a piece of ribbon into 3 pieces. <br>The first piece is 20 cm. <br>The second is 15 cm. <br> The last piece of ribbon is 8 cm longer than the second piece of ribbon.<hr>The length of the ribbon is <input min="0" type="number" id ="imp2pg108q5_2" class="lineinput" placeholder="?" /> cm at first.