A bottle of oil is placed on the left side of the balance, and (3/8) bottle of oil and (1/8) kilogram weight are placed on the right side of the balance. The balance is just balanced. How many kilograms does a bottle of oil weigh?
天平左边的盘里放着一瓶油，右边的盘里放着(3/8)瓶油和(1/8)千克重的砝码，天平正好平衡，一瓶油重多少千克．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">8 / 5</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">(1/8) * (8/5)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>