PSLE
Diana had to sew 200 sweaters. She sewed 8 sweaters each day from Monday to Friday and 13 each day on Saturday and Sunday. Starting on a Wednesday, on which day of the week did Diana finish sewing all the sweaters? Give your answer in number. (Eg Mon = 1)
Number of weekdays that Diana sewed on the first week = 3

Number of sweaters that Diana completed for from Wednesday to Sunday on the first week
= 3 x 8 + 2 x 13 
= 24 + 26
= 50

Number of sweaters left to sew
= 200 - 50
= 150

Number of sweaters that Diana could sew per week from second week onwards
= 5 x 8 + 2 x 13
= 40 + 26
= 66

Number of weeks that Diana needed to sew 150 sweaters
= 150 ÷ 66
= 2 r 18

Number of days that Diana needed to sew 18 sweaters
= 18 ÷ 8
= 2 r 2

Diana needed 1 more day to finish sewing the remaining 2 sweaters.

Day of the week that Diana completed her sewing
= 2 + 1
= 3 (Wed)

Answer(s): 3