PSLE
Sabrina and Zara each had a plate of dough of the same mass for making sandwiches. The same mass of dough was used for each sandwich. Sabrina made 30 sandwiches and had 500 g of dough left. Zara made 14 sandwiches and had 1.22 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 Sabrina and Zara
= 30 - 14
= 16

1 kg = 1000 g
1.22 kg = 1.22 x 1000 = 1220 g

Difference between the remaining dough left by Zara and Sabrina
= 1220 - 500
= 720 g

Mass of 16 sandwiches = 720 g

Mass of 1 sandwich
= 720 ÷ 16
= 45 g

(b)
Total remaining dough left
= 1220 + 500
= 1720 g

Sets of 45 g
= 1720 ÷ 45
= 38 r 10

Number of sandwiches = 38

Answer(s): (a) 45 g; (b) 38