What is the product of the sum of (1/3) and (1/5) multiplied by (8/15)?
(1/3)与(1/5)的和乘(8/15)，积是多少？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">(1/3) + (1/5)</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">(8/15) * (8/15)</gadget>
<output>64/225 = around 0.284444</output>

<result>64/225 = around 0.284444</result>