PSLE
Rachel and Raeann each had a plate of dough of the same mass for making sandwiches. The same mass of dough was used for each sandwich. Rachel made 37 sandwiches and had 305 g of dough left. Raeann made 17 sandwiches and had 1.005 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 Rachel and Raeann
= 37 - 17
= 20

1 kg = 1000 g
1.005 kg = 1.005 x 1000 = 1005 g

Difference between the remaining dough left by Raeann and Rachel
= 1005 - 305
= 700 g

Mass of 20 sandwiches = 700 g

Mass of 1 sandwich
= 700 ÷ 20
= 35 g

(b)
Total remaining dough left
= 1005 + 305
= 1310 g

Sets of 35 g
= 1310 ÷ 35
= 37 r 15

Number of sandwiches = 37

Answer(s): (a) 35 g; (b) 37