When a=15, b=20, how much is 5a+6b﹦
当a=15，b=20时，5a+6b﹦多少
<gadget id="calculator">5 * 15</gadget>
<output>75</output>

<gadget id="calculator">6 * 20</gadget>
<output>120</output>

<gadget id="calculator">75 + 120</gadget>
<output>195</output>

<result>195</result>