Grandma Li’s house uses (7/8) tons of water a month. According to this calculation, how many tons did her house use in the first half of the year?
李奶奶家一个月用水(7/8)吨，照这样计算，她家上半年用水多少吨？
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">(7/8) * 6</gadget>
<output>21/4 = around 5.25</output>

<result>21/4 = around 5.25</result>