The ratio of stamps between Mingming and Liangliang is 2:5, Mingming has 42 stamps, how many are Liangliang?
明明和亮亮的邮票张数比是2：5，明明有42张，亮亮有多少张．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">42 / (2/5)</gadget>
<output>105</output>

<result>105</result>