When the number a is divided by the number b, the quotient is 12 and the remainder is 8. If you add 7 to a and divide the sum by b, the quotient is 13 and the remainder is 0. What is the number a?
数a除以数b，商12时余8，若给a加上7，用和除以b，商是13，余数是0，数a是多少．
<gadget id="calculator">8 + 7</gadget>
<output>15</output>

<gadget id="calculator">12 * 15</gadget>
<output>180</output>

<gadget id="calculator">180 + 8</gadget>
<output>188</output>

<result>188</result>