When a number is divided by 40, the quotient is the largest two-digit number and the remainder is 15. What is the number?
一个数除以40，商是最大的两位数，余数是15，这个数是多少．
<gadget id="calculator">40 * 99</gadget>
<output>3_960</output>

<gadget id="calculator">3_960 + 15</gadget>
<output>3_975</output>

<result>3_975</result>