Aunt Wang brought 100 yuan to buy vegetables, and spent 28.7 yuan to buy meat dishes, and 6.3 yuan less to buy vegetarian dishes than meat dishes. How much does it cost to buy two dishes?
王阿姨带100元钱去买菜，买荤菜用去28.7元，买素菜比荤菜少用去6.3元．买两样菜一共用去多少元？
<gadget id="calculator">28.7 - 6.3</gadget>
<output>22.4</output>

<gadget id="calculator">28.7 + 22.4</gadget>
<output>51.1</output>

<result>51.1</result>