Wangjiang Primary School advocates saving water. In May, 42 tons of water was used, which was 1/8 less than in April. How many tons of water was used in April?
望江小学提倡节约用水，五月份用水42吨，比四月份节约了(1/8)，四月份用水多少吨．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">42 / (7/8)</gadget>
<output>48</output>

<result>48</result>