The area of a house is 126 square meters, the living room occupies about 1/6 of the house, and the bedroom occupies 2/7 of the whole house. How many square meters is the bedroom larger than the living room?
一套住房面积是126平方米，客厅面积大约占住房的(1/6)，卧室占整套住房的(2/7)，卧室比客厅大多少平方米？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(2/7) - (1/6)</gadget>
<output>5/42 = around 0.119048</output>

<gadget id="calculator">126 * (5/42)</gadget>
<output>15</output>

<result>15</result>