PSLE
Usha and Irene each had a plate of dough of the same mass for making croissants. The same mass of dough was used for each croissant. Usha made 33 croissants and had 430 g of dough left. Irene made 17 croissants and had 1.07 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 Usha and Irene
= 33 - 17
= 16

1 kg = 1000 g
1.07 kg = 1.07 x 1000 = 1070 g

Difference between the remaining dough left by Irene and Usha
= 1070 - 430
= 640 g

Mass of 16 croissants = 640 g

Mass of 1 croissant
= 640 ÷ 16
= 40 g

(b)
Total remaining dough left
= 1070 + 430
= 1500 g

Sets of 40 g
= 1500 ÷ 40
= 37 r 20

Number of croissants = 37

Answer(s): (a) 40 g; (b) 37