PSLE
Hazel and Jean each had a plate of dough of the same mass for making sandwiches. The same mass of dough was used for each sandwich. Hazel made 41 sandwiches and had 470 g of dough left. Jean made 23 sandwiches and had 1.01 kg of dough left.

1. What was the mass of dough needed for each sandwich?
2. With the remaining dough from both girls, how many more such sandwiches can be made at most? 

(a)
Difference between the number of sandwiches made by Hazel and Jean
= 41 - 23
= 18

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

Difference between the remaining dough left by Jean and Hazel
= 1010 - 470
= 540 g

Mass of 18 sandwiches = 540 g

Mass of 1 sandwich
= 540 ÷ 18
= 30 g

(b)
Total remaining dough left
= 1010 + 470
= 1480 g

Sets of 30 g
= 1480 ÷ 30
= 49 r 10

Number of sandwiches = 49

Answer(s): (a) 30 g; (b) 49