PSLE
Ivory and Nora each had a plate of dough of the same mass for making sandwiches. The same mass of dough was used for each sandwich. Ivory made 50 sandwiches and had 500 g of dough left. Nora made 32 sandwiches and had 1.04 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 Ivory and Nora
= 50 - 32
= 18

1 kg = 1000 g
1.04 kg = 1.04 x 1000 = 1040 g

Difference between the remaining dough left by Nora and Ivory
= 1040 - 500
= 540 g

Mass of 18 sandwiches = 540 g

Mass of 1 sandwich
= 540 ÷ 18
= 30 g

(b)
Total remaining dough left
= 1040 + 500
= 1540 g

Sets of 30 g
= 1540 ÷ 30
= 51 r 10

Number of sandwiches = 51

Answer(s): (a) 30 g; (b) 51