The furniture store sold 6 folding chairs in the morning and the rest (2/3) in the afternoon. If 10 folding chairs were sold in the afternoon, how many folding chairs did the furniture store have?
家俬店上午售出折椅6张，下午售出余下的(2/3)，如果下午售出了折椅10张，家具店原有折椅多少张？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">10 / (2/3)</gadget>
<output>15</output>

<gadget id="calculator">15 + 6</gadget>
<output>21</output>

<result>21</result>