I've seen a lot of THIS KIND OF MATHMATICS quiz

But there is always a trap,

shouldn't have added like that as u did.

 3X9=27 = PLUS 2QR (TIP)=29 QR    <-----IS COMPLETLELY WRONG

CORRECT WAY IS

1. 25QR IN THE BILL

2.THEY PAID 10 QR EACH =30QR

3.THE WAITER BROGHT 5 QR BACK.

4. THEY DEVIDED 1 QR EACH SO THAT 3 QR GONE.

4. SO REST OF 2 QR IS FOR THE WAITER

SIMPLY FINAL ANSWER:

BASICALLY EVERYONE PAID 9 QR EACH(COZ THEY GOT 1 QR BACK)

SO WHICH MEANS TOTAL OF 27 QR HAS GATHERED.

25QR FOR THE FOOD AND 2QR FOR THE WAITER.