Two barrels of oil, A and B, weigh 15 kilograms in total. Take (1/5) from barrel A and (1/5) from barrel B. How many kilograms are taken out in total?
甲、乙两桶油共重15千克，从甲桶里取出(1/5)，从乙桶里也取出(1/5)，共取出多少千克．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">15 * (1/5)</gadget>
<output>3</output>

<result>3</result>