Add the quotient of 13 and 2.1 divided by 3.5, and multiply by (1/5). What is the product?
13与2.1除3.5的商相加，再乘以(1/5)．积是多少？
<gadget id="calculator">3.5 / 2.1</gadget>
<output>1.666667</output>

<gadget id="calculator">13 + 1.666667</gadget>
<output>14.666667</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">14.666667 * (1/5)</gadget>
<output>2.933333</output>

<result>2.933333</result>