Fatal error: Uncaught TypeError: Unsupported operand types: string - int in /home/wp080980/kkmon.com/public_html/fp3.kkmon.com/past/question.php:40
Stack trace:
#0 {main}
thrown in /home/wp080980/kkmon.com/public_html/fp3.kkmon.com/past/question.php on line 40