PSLE
Zara had to sew 66 vests. She sewed 4 vests each day from Monday to Friday and 7 each day on Saturday and Sunday. Starting on a Wednesday, on which day of the week did Zara finish sewing all the vests? Give your answer in number. (Eg Mon = 1)
Number of weekdays that Zara sewed on the first week = 3

Number of vests that Zara completed for from Wednesday to Sunday on the first week
= 3 x 4 + 2 x 7 
= 12 + 14
= 26

Number of vests left to sew
= 66 - 26
= 40

Number of vests that Zara could sew per week from second week onwards
= 5 x 4 + 2 x 7
= 20 + 14
= 34

Number of weeks that Zara needed to sew 40 vests
= 40 ÷ 34
= 1 r 6

Number of days that Zara needed to sew 6 vests
= 6 ÷ 4
= 1 r 2

Zara needed 1 more day to finish sewing the remaining 2 vests.

Day of the week that Zara completed her sewing
= 1 + 1
= 2 (Tue)

Answer(s): 2