When a number is divided by 29, the quotient and remainder are both 9. What is the number?
一个数除以29，商和余数都是9，这个数是多少．
<gadget id="calculator">29 * 9</gadget>
<output>261</output>

<gadget id="calculator">261 + 9</gadget>
<output>270</output>

<result>270</result>