Distribute tableware in a picnic in a certain class: each person has a rice bowl, two people have a vegetable bowl, and four people have a soup bowl. 49 bowls are shared, how many people participated in the picnic?
某班野炊中分配餐具：每人一个饭碗，两人一个菜碗，四人一个汤碗．共用49个碗，问共有多少人参加野炊？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/2) + (1/4)</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">49 / (7/4)</gadget>
<output>28</output>

<result>28</result>