PSLE Elyse baked some puffs. She gave
16 of the puffs to her friends and 80 to her relatives. She was left with
12 of the puffs. She packed these into 18 boxes. Some boxes contained 5 puffs while the rest contained 8 puffs.
- How many puffs were packed into the 18 boxes?
- How many boxes contained 8 puffs?
(a)
Fraction of the puffs given to her relatives
= 1 -
16 -
12
= 1 -
16 -
36 =
26 Number of puffs that Elyse gave to her relatives = 2 u
2 u = 80
1 u = 80 ÷ 2 = 40
Number of puffs that were packed in 18 boxes
= 3 u
= 3 x 40
= 120
Number of puffs that were packed in 18 boxes = 120
Boxes of 8 |
Puffs |
Boxes of 5 |
Puffs |
Total puffs |
18 |
144 |
0 |
0 |
144 |
17 |
136 |
1 |
5 |
141 |
If all the puffs are packed in boxes of 8, the number of puffs needed
= 18 x 8
= 144
Small difference
= 144 - 141
= 3
Big difference
= 144 - 120
= 24
Number of boxes of 5 puffs
= 24 ÷ 3
= 8
Number of boxes of 8 puffs
= 18 - 8
= 10
Answer(s): (a) 120; (b) 10