When a=5, B=7, what is 4a+7b equal to
当a=5，B=7时，4a+7b等于多少
<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">7 * 7</gadget>
<output>49</output>

<gadget id="calculator">20 + 49</gadget>
<output>69</output>

<result>69</result>