PSLE
Olivia and Dana each had a plate of dough of the same mass for making sandwiches. The same mass of dough was used for each sandwich. Olivia made 34 sandwiches and had 320 g of dough left. Dana made 16 sandwiches and had 1.13 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 Olivia and Dana
= 34 - 16
= 18

1 kg = 1000 g
1.13 kg = 1.13 x 1000 = 1130 g

Difference between the remaining dough left by Dana and Olivia
= 1130 - 320
= 810 g

Mass of 18 sandwiches = 810 g

Mass of 1 sandwich
= 810 ÷ 18
= 45 g

(b)
Total remaining dough left
= 1130 + 320
= 1450 g

Sets of 45 g
= 1450 ÷ 45
= 32 r 10

Number of sandwiches = 32

Answer(s): (a) 45 g; (b) 32