The Smurfs and Naughty bought a total of 20 glass beads. If the Smurfs gave Naughty 6, the Smurfs would have 2 less than Naughty. Ask how many glass beads Naughty bought.
蓝精灵、淘气二人共买了20颗玻璃珠，如果蓝精灵给淘气6颗，那么蓝精灵就比淘气少2颗．问淘气买了多少颗玻璃珠．
<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">12 - 2</gadget>
<output>10</output>

<gadget id="calculator">20 - 10</gadget>
<output>10</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<result>5</result>