PSLE Shiyun baked some cupcakes. She gave
15 of the cupcakes to her students and 75 to her colleagues. She was left with
12 of the cupcakes. She packed these into 15 boxes. Some boxes contained 5 cupcakes while the rest contained 10 cupcakes.
- How many cupcakes were packed into the 15 boxes?
- How many boxes contained 10 cupcakes?
(a)
Fraction of the cupcakes given to her colleagues
= 1 -
15 -
12
= 1 -
210 -
510 =
310 Number of cupcakes that Shiyun gave to her colleagues = 3 u
3 u = 75
1 u = 75 ÷ 3 = 25
Number of cupcakes that were packed in 15 boxes
= 5 u
= 5 x 25
= 125
Number of cupcakes that were packed in 15 boxes = 125
Boxes of 10 |
Cupcakes |
Boxes of 5 |
Cupcakes |
Total cupcakes |
15 |
150 |
0 |
0 |
150 |
14 |
140 |
1 |
5 |
145 |
If all the cupcakes are packed in boxes of 10, the number of cupcakes needed
= 15 x 10
= 150
Small difference
= 150 - 145
= 5
Big difference
= 150 - 125
= 25
Number of boxes of 5 cupcakes
= 25 ÷ 5
= 5
Number of boxes of 10 cupcakes
= 15 - 5
= 10
Answer(s): (a) 125; (b) 10