The product of a certain number and 15, plus 8.2, is equal to 28 times 0.4, find this number.
某个数与15的积，加上8.2，等于28乘0.4，求这个数．
<gadget id="calculator">28 * 0.4</gadget>
<output>11.2</output>

<gadget id="calculator">11.2 - 8.2</gadget>
<output>3</output>

<gadget id="calculator">3 / 15</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>