PSLE
Tina had to sew 113 coats. She sewed 7 coats each day from Monday to Friday and 10 each day on Saturday and Sunday. Starting on a Thursday, on which day of the week did Tina finish sewing all the coats? Give your answer in number. (Eg Mon = 1)
Number of weekdays that Tina sewed on the first week = 2

Number of coats that Tina completed for from Thursday to Sunday on the first week
= 2 x 7 + 2 x 10 
= 14 + 20
= 34

Number of coats left to sew
= 113 - 34
= 79

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

Number of weeks that Tina needed to sew 79 coats
= 79 ÷ 55
= 1 r 24

Number of days that Tina needed to sew 24 coats
= 24 ÷ 7
= 3 r 3

Tina needed 1 more day to finish sewing the remaining 3 coats.

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

Answer(s): 4