The number of A is the number of B (4/5), the sum of the two numbers of A and B is 480, what is the number of A?
甲数是乙数的(4/5)，甲乙两数的和是480，甲数是多少．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) + 1</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">480 / (9/5)</gadget>
<output>800/3 = around 266.666667</output>

<gadget id="calculator">(4/5) * (800/3)</gadget>
<output>640/3 = around 213.333333</output>

<result>640/3 = around 213.333333</result>