PSLE
Xuan had to sew 119 coats. She sewed 7 coats each day from Monday to Friday and 13 each day on Saturday and Sunday. Starting on a Friday, on which day of the week did Xuan finish sewing all the coats? Give your answer in number. (Eg Mon = 1)
Number of weekdays that Xuan sewed on the first week = 1

Number of coats that Xuan completed for from Friday to Sunday on the first week
= 1 x 7 + 2 x 13 
= 7 + 26
= 33

Number of coats left to sew
= 119 - 33
= 86

Number of coats that Xuan could sew per week from second week onwards
= 5 x 7 + 2 x 13
= 35 + 26
= 61

Number of weeks that Xuan needed to sew 86 coats
= 86 ÷ 61
= 1 r 25

Number of days that Xuan needed to sew 25 coats
= 25 ÷ 7
= 3 r 4

Xuan needed 1 more day to finish sewing the remaining 4 coats.

Day of the week that Xuan completed her sewing
= 3 + 1
= 4 (Thu)

Answer(s): 4