PSLE
Gillian and Barbara each had a plate of dough of the same mass for making croissants. The same mass of dough was used for each croissant. Gillian made 37 croissants and had 490 g of dough left. Barbara made 17 croissants and had 1.09 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 Gillian and Barbara
= 37 - 17
= 20

1 kg = 1000 g
1.09 kg = 1.09 x 1000 = 1090 g

Difference between the remaining dough left by Barbara and Gillian
= 1090 - 490
= 600 g

Mass of 20 croissants = 600 g

Mass of 1 croissant
= 600 ÷ 20
= 30 g

(b)
Total remaining dough left
= 1090 + 490
= 1580 g

Sets of 30 g
= 1580 ÷ 30
= 52 r 20

Number of croissants = 52

Answer(s): (a) 30 g; (b) 52