A: B=5:2, A is 2.7 larger than B. Find the second number.
甲：乙=5：2，甲比乙大2.7．求乙数．
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">2.7 / 3</gadget>
<output>0.9</output>

<gadget id="calculator">0.9 * 2</gadget>
<output>1.8</output>

<result>1.8</result>