Xiaohong goes to the store to buy pencils and pens. All the money can buy 6 pencils and 3 pens, or 10 pencils and 2 pens. If she buys all pencils, how many can she buy?
小红到商店买铅笔和钢笔，全部的钱可以买6支铅笔和3支钢笔，或者10支铅笔和2支钢笔，如果全部买铅笔，可以买多少支．
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">6 + 12</gadget>
<output>18</output>

<result>18</result>