It is known that (2/3) of the weight of pears and apples weigh 620 kg, and (1/4) of the weight of pears is equal to (2/5) of the weight of apples. How many kilograms does a pear weigh?
已知梨重量的(2/3)与苹果共重620千克，梨重量的(1/4)与苹果重量的(2/5)相等．梨重多少千克？
<gadget id="calculator">4 / 1</gadget>
<output>4</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">4 * (2/3)</gadget>
<output>8/3 = around 2.666667</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(8/3) + (5/2)</gadget>
<output>31/6 = around 5.166667</output>

<gadget id="calculator">620 / (31/6)</gadget>
<output>120</output>

<gadget id="calculator">120 * 4</gadget>
<output>480</output>

<result>480</result>