PSLE
Kimberly and Elyse each had a plate of dough of the same mass for making croissants. The same mass of dough was used for each croissant. Kimberly made 39 croissants and had 290 g of dough left. Elyse made 21 croissants and had 1.01 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 Kimberly and Elyse
= 39 - 21
= 18

1 kg = 1000 g
1.01 kg = 1.01 x 1000 = 1010 g

Difference between the remaining dough left by Elyse and Kimberly
= 1010 - 290
= 720 g

Mass of 18 croissants = 720 g

Mass of 1 croissant
= 720 ÷ 18
= 40 g

(b)
Total remaining dough left
= 1010 + 290
= 1300 g

Sets of 40 g
= 1300 ÷ 40
= 32 r 20

Number of croissants = 32

Answer(s): (a) 40 g; (b) 32