A piece of wood cut off 28 meters is exactly (4/7), how many meters is this piece of wood long? Calculation formula: how much.
一段木料截去28米正好是(4/7)，这段木料长多少米？算式：多少．
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

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

<result>49</result>