“4 children went to buy 4 meals, x and x2 ordered the meal and y1 and y2 ordered the sando, x1 and x2 have to pay 50 each but only had notes of 100 and 50, y1 and y2 had to pay 35 and 45 respectively, but only had notes of 100 and 50, there was a delivery charge of 4, the total of the bill was 184, if x1 and y1 paid their 100’s (for a total of 200) how much should y1 and y2 pay x1 and x2