PSLE Mary and Kathy each had a plate of dough of the same mass for making tarts. The same mass of dough was used for each tart. Mary made 39 tarts and had 145 g of dough left. Kathy made 19 tarts and had 1.045 kg of dough left.
- What was the mass of dough needed for each tart?
- With the remaining dough from both girls, how many more such tarts can be made at most?
(a)
Difference between the number of tarts made by Mary and Kathy
= 39 - 19
= 20
1 kg = 1000 g
1.045 kg = 1.045 x 1000 = 1045 g
Difference between the remaining dough left by Kathy and Mary
= 1045 - 145
= 900 g
Mass of 20 tarts = 900 g
Mass of 1 tart
= 900 ÷ 20
= 45 g
(b)
Total remaining dough left
= 1045 + 145
= 1190 g
Sets of 45 g
= 1190 ÷ 45
= 26 r 20
Number of tarts = 26
Answer(s): (a) 45 g; (b) 26