There are 15 pieces of wood, 10 are long and 5 are short, the long ones are cut into 4 pieces, and the short ones are cut into 2 pieces, how many times do you need to saw them in total?
有15根木料，10根长的，5根短的，把长的锯成4段，把短的锯成2段，一共要锯多少次．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">1 * 5</gadget>
<output>5</output>

<gadget id="calculator">30 + 5</gadget>
<output>35</output>

<result>35</result>