Xiao Ming's weight was originally lighter than his mother's (5/12). Later, Xiao Ming's weight increased by 5 kg, while his mother's weight remained the same. The ratio of Xiao Ming's weight to his mother's was 2:3. What is his mother's weight in kilograms?
小明的体重原来比妈妈轻(5/12)，后来小明的体重增加了5千克，而妈妈的体重不变，小明的体重与妈妈的比是2：3，请问妈妈的体重是多少千克？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">1 - (5/12)</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">(2/3) - (7/12)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">5 / (1/12)</gadget>
<output>60</output>

<result>60</result>