PSLE
Joelle had to sew 78 jumpsuits. She sewed 4 jumpsuits each day from Monday to Friday and 10 each day on Saturday and Sunday. Starting on a Friday, on which day of the week did Joelle finish sewing all the jumpsuits? Give your answer in number. (Eg Mon = 1)
Number of weekdays that Joelle sewed on the first week = 1

Number of jumpsuits that Joelle completed for from Friday to Sunday on the first week
= 1 x 4 + 2 x 10 
= 4 + 20
= 24

Number of jumpsuits left to sew
= 78 - 24
= 54

Number of jumpsuits that Joelle could sew per week from second week onwards
= 5 x 4 + 2 x 10
= 20 + 20
= 40

Number of weeks that Joelle needed to sew 54 jumpsuits
= 54 ÷ 40
= 1 r 14

Number of days that Joelle needed to sew 14 jumpsuits
= 14 ÷ 4
= 3 r 2

Joelle needed 1 more day to finish sewing the remaining 2 jumpsuits.

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

Answer(s): 4