PSLE
Xylia and Kimberly each had a plate of dough of the same mass for making muffins. The same mass of dough was used for each muffin. Xylia made 39 muffins and had 290 g of dough left. Kimberly made 21 muffins and had 1.01 kg of dough left.

1. What was the mass of dough needed for each muffin?
2. With the remaining dough from both girls, how many more such muffins can be made at most? 

(a)
Difference between the number of muffins made by Xylia and Kimberly
= 39 - 21
= 18

1 kg = 1000 g
1.01 kg = 1.01 x 1000 = 1010 g

Difference between the remaining dough left by Kimberly and Xylia
= 1010 - 290
= 720 g

Mass of 18 muffins = 720 g

Mass of 1 muffin
= 720 ÷ 18
= 40 g

(b)
Total remaining dough left
= 1010 + 290
= 1300 g

Sets of 40 g
= 1300 ÷ 40
= 32 r 20

Number of muffins = 32

Answer(s): (a) 40 g; (b) 32