PSLE
Opal and Lynn each had a plate of dough of the same mass for making sandwiches. The same mass of dough was used for each sandwich. Opal made 32 sandwiches and had 440 g of dough left. Lynn made 12 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 Opal and Lynn
= 32 - 12
= 20

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

Difference between the remaining dough left by Lynn and Opal
= 1040 - 440
= 600 g

Mass of 20 sandwiches = 600 g

Mass of 1 sandwich
= 600 ÷ 20
= 30 g

(b)
Total remaining dough left
= 1040 + 440
= 1480 g

Sets of 30 g
= 1480 ÷ 30
= 49 r 10

Number of sandwiches = 49

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