Xiao Ming bought a book and a schoolbag. It costs 5 yuan and 80 cents to buy a book, and the money used to buy a schoolbag is 5 times the money used to buy a book. He brought 50 yuan, how much money is left?
小明买了一本书和一只书包．买书用去5元8角，买书包用的钱是买书所用钱的5倍．他带去50元钱，还剩多少元？
<gadget id="calculator">8 / 10</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5 + (4/5)</gadget>
<output>29/5 = around 5.8</output>

<gadget id="calculator">(29/5) * 5</gadget>
<output>29</output>

<gadget id="calculator">29 + (29/5)</gadget>
<output>174/5 = around 34.8</output>

<gadget id="calculator">50 - (174/5)</gadget>
<output>76/5 = around 15.2</output>

<result>76/5 = around 15.2</result>