Teacher Ma bought 6 sets of checkers for the extracurricular group, each set was 3 yuan 3.4 cents, leaving 9 yuan 9 cents 6 cents. How much yuan did Teacher Ma have?
马老师给课外小组买了6副跳棋，每副3元3角4分，还剩9元9角6分，马老师原来有多少元？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">4 / 100</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">3 + (3/10) + (1/25)</gadget>
<output>167/50 = around 3.34</output>

<gadget id="calculator">6 * (167/50)</gadget>
<output>501/25 = around 20.04</output>

<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">6 / 100</gadget>
<output>3/50 = around 0.06</output>

<gadget id="calculator">9 + (9/10) + (3/50)</gadget>
<output>249/25 = around 9.96</output>

<gadget id="calculator">(501/25) + (249/25)</gadget>
<output>30</output>

<result>30</result>