PSLE
Jean had to sew 79 windbreakers. She sewed 5 windbreakers each day from Monday to Friday and 8 each day on Saturday and Sunday. Starting on a Friday, on which day of the week did Jean finish sewing all the windbreakers? Give your answer in number. (Eg Mon = 1)
Number of weekdays that Jean sewed on the first week = 1

Number of windbreakers that Jean completed for from Friday to Sunday on the first week
= 1 x 5 + 2 x 8 
= 5 + 16
= 21

Number of windbreakers left to sew
= 79 - 21
= 58

Number of windbreakers that Jean could sew per week from second week onwards
= 5 x 5 + 2 x 8
= 25 + 16
= 41

Number of weeks that Jean needed to sew 58 windbreakers
= 58 ÷ 41
= 1 r 17

Number of days that Jean needed to sew 17 windbreakers
= 17 ÷ 5
= 3 r 2

Jean needed 1 more day to finish sewing the remaining 2 windbreakers.

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

Answer(s): 4