PSLE
Abi and Penelope each had a plate of dough of the same mass for making sandwiches. The same mass of dough was used for each sandwich. Abi made 30 sandwiches and had 500 g of dough left. Penelope made 10 sandwiches and had 1.2 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 Abi and Penelope
= 30 - 10
= 20

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

Difference between the remaining dough left by Penelope and Abi
= 1200 - 500
= 700 g

Mass of 20 sandwiches = 700 g

Mass of 1 sandwich
= 700 ÷ 20
= 35 g

(b)
Total remaining dough left
= 1200 + 500
= 1700 g

Sets of 35 g
= 1700 ÷ 35
= 48 r 20

Number of sandwiches = 48

Answer(s): (a) 35 g; (b) 48