The kilograms of the weight of children aged 6 to 10 are generally "chronological age * 2 + 7". Xiaohua is 8 years old this year, please calculate Xiaohua's weight according to this formula.
6至10岁儿童体重的千克数一般是"实足年龄*2+7"．小华今年8岁，请你根据这个公式算算小华的体重．
<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<gadget id="calculator">16 + 7</gadget>
<output>23</output>

<result>23</result>