PSLE
Erika and Gabby each had a plate of dough of the same mass for making sandwiches. The same mass of dough was used for each sandwich. Erika made 31 sandwiches and had 455 g of dough left. Gabby made 17 sandwiches and had 1.085 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 Erika and Gabby
= 31 - 17
= 14

1 kg = 1000 g
1.085 kg = 1.085 x 1000 = 1085 g

Difference between the remaining dough left by Gabby and Erika
= 1085 - 455
= 630 g

Mass of 14 sandwiches = 630 g

Mass of 1 sandwich
= 630 ÷ 14
= 45 g

(b)
Total remaining dough left
= 1085 + 455
= 1540 g

Sets of 45 g
= 1540 ÷ 45
= 34 r 10

Number of sandwiches = 34

Answer(s): (a) 45 g; (b) 34