Xiao Ming bought 3 pencils and an eraser worth 8 cents, and each pencil cost 5 cents. How much did he spend in total?
小明买了3支铅笔和一块8角钱的橡皮，每支铅笔5角钱，一共花了多少角钱．
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">15 + 8</gadget>
<output>23</output>

<result>23</result>