PSLE
Sarah had to sew 191 blazers. She sewed 7 blazers each day from Monday to Friday and 10 each day on Saturday and Sunday. Starting on a Monday, on which day of the week did Sarah finish sewing all the blazers? Give your answer in number. (Eg Mon = 1)
Number of weekdays that Sarah sewed on the first week = 5

Number of blazers that Sarah completed for from Monday to Sunday on the first week
= 5 x 7 + 2 x 10 
= 35 + 20
= 55

Number of blazers left to sew
= 191 - 55
= 136

Number of blazers that Sarah could sew per week from second week onwards
= 5 x 7 + 2 x 10
= 35 + 20
= 55

Number of weeks that Sarah needed to sew 136 blazers
= 136 ÷ 55
= 2 r 26

Number of days that Sarah needed to sew 26 blazers
= 26 ÷ 7
= 3 r 5

Sarah needed 1 more day to finish sewing the remaining 5 blazers.

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

Answer(s): 4