PSLE
Kathy and Joelle each had a plate of dough of the same mass for making croissants. The same mass of dough was used for each croissant. Kathy made 31 croissants and had 310 g of dough left. Joelle made 11 croissants and had 1.11 kg of dough left.

1. What was the mass of dough needed for each croissant?
2. With the remaining dough from both girls, how many more such croissants can be made at most? 

(a)
Difference between the number of croissants made by Kathy and Joelle
= 31 - 11
= 20

1 kg = 1000 g
1.11 kg = 1.11 x 1000 = 1110 g

Difference between the remaining dough left by Joelle and Kathy
= 1110 - 310
= 800 g

Mass of 20 croissants = 800 g

Mass of 1 croissant
= 800 ÷ 20
= 40 g

(b)
Total remaining dough left
= 1110 + 310
= 1420 g

Sets of 40 g
= 1420 ÷ 40
= 35 r 20

Number of croissants = 35

Answer(s): (a) 40 g; (b) 35