a and b are both natural numbers, ((a)/13)+((b)/4)=(29/52), then a+b=how much.
a，b都是自然数，((a)/13)+((b)/4)=(29/52)，则a+b=多少．
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">29 - 16</gadget>
<output>13</output>

<gadget id="calculator">13 / 13</gadget>
<output>1</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<result>5</result>