Subtract 1.47 from 2.8 times a number to get 2.45. Find this number. (solution by equation)
一个数的2.8倍减去1.47得2.45，求这个数．(用方程解)
<gadget id="calculator">2.45 + 1.47</gadget>
<output>3.92</output>

<gadget id="calculator">3.92 / 2.8</gadget>
<output>1.4</output>

<result>1.4</result>