PSLE
Lynn had to sew 213 windbreakers. She sewed 5 windbreakers each day from Monday to Friday and 12 each day on Saturday and Sunday. Starting on a Monday, on which day of the week did Lynn finish sewing all the windbreakers? Give your answer in number. (Eg Mon = 1)
Number of weekdays that Lynn sewed on the first week = 5

Number of windbreakers that Lynn completed for from Monday to Sunday on the first week
= 5 x 5 + 2 x 12 
= 25 + 24
= 49

Number of windbreakers left to sew
= 213 - 49
= 164

Number of windbreakers that Lynn could sew per week from second week onwards
= 5 x 5 + 2 x 12
= 25 + 24
= 49

Number of weeks that Lynn needed to sew 164 windbreakers
= 164 ÷ 49
= 3 r 17

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

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

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

Answer(s): 4