PSLE
Lynn and Tina each had a plate of dough of the same mass for making croissants. The same mass of dough was used for each croissant. Lynn made 30 croissants and had 300 g of dough left. Tina made 10 croissants and had 1.2 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 Lynn and Tina
= 30 - 10
= 20

1 kg = 1000 g
1.2 kg = 1.2 x 1000 = 1200 g

Difference between the remaining dough left by Tina and Lynn
= 1200 - 300
= 900 g

Mass of 20 croissants = 900 g

Mass of 1 croissant
= 900 ÷ 20
= 45 g

(b)
Total remaining dough left
= 1200 + 300
= 1500 g

Sets of 45 g
= 1500 ÷ 45
= 33 r 15

Number of croissants = 33

Answer(s): (a) 45 g; (b) 33