PSLE
Xandra and Esther each had a plate of dough of the same mass for making croissants. The same mass of dough was used for each croissant. Xandra made 30 croissants and had 450 g of dough left. Esther made 12 croissants and had 1.17 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 Xandra and Esther
= 30 - 12
= 18

1 kg = 1000 g
1.17 kg = 1.17 x 1000 = 1170 g

Difference between the remaining dough left by Esther and Xandra
= 1170 - 450
= 720 g

Mass of 18 croissants = 720 g

Mass of 1 croissant
= 720 ÷ 18
= 40 g

(b)
Total remaining dough left
= 1170 + 450
= 1620 g

Sets of 40 g
= 1620 ÷ 40
= 40 r 20

Number of croissants = 40

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