PSLE
Ivory had to sew 191 vests. She sewed 8 vests each day from Monday to Friday and 15 each day on Saturday and Sunday. Starting on a Friday, on which day of the week did Ivory finish sewing all the vests? Give your answer in number. (Eg Mon = 1)
Number of weekdays that Ivory sewed on the first week = 1

Number of vests that Ivory completed for from Friday to Sunday on the first week
= 1 x 8 + 2 x 15 
= 8 + 30
= 38

Number of vests left to sew
= 191 - 38
= 153

Number of vests that Ivory could sew per week from second week onwards
= 5 x 8 + 2 x 15
= 40 + 30
= 70

Number of weeks that Ivory needed to sew 153 vests
= 153 ÷ 70
= 2 r 13

Number of days that Ivory needed to sew 13 vests
= 13 ÷ 8
= 1 r 5

Ivory needed 1 more day to finish sewing the remaining 5 vests.

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

Answer(s): 2