Xiao Ming’s family pays 200 yuan for the telephone bill this month, and the electricity bill is 3/5 of the telephone bill, and at the same time it is 4 times the gas bill. How much is the gas bill that Xiao Ming’s family paid this month?
小明家本月支出的电话费200元，支出的电费是电话费的(3/5)，同时以是煤气费的4倍，小明家本月支出的煤气费是多少．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) / 4</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">200 * (3/20)</gadget>
<output>30</output>

<result>30</result>