A's number is 340, B's number is 80, how much A's number gives to B's number, the ratio of A's and B's two numbers is 5:2.
甲数是340，乙数是80，甲数给乙数多少，甲乙两数的比是5：2．
<gadget id="calculator">340 + 80</gadget>
<output>420</output>

<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">420 * (5/7)</gadget>
<output>300</output>

<gadget id="calculator">340 - 300</gadget>
<output>40</output>

<result>40</result>