Zoe made 455 scones and cupcakes. After she gave 0.3 of the scones and 0.4 of the cupcakes to her students, she was left with an equal number of scones and cupcakes. How many scones had she left?
| |
Scones |
Cupcakes |
Before
|
10x3 =
30 u |
5x7 =
35 u |
Change
|
- 3x3 =
- 9 u |
- 2x7 =
- 14 u |
After
|
7x3 =
21 u |
3x7 =
21 u |
Comparing scones and
cupcakes in the end |
1x21 =
21 u |
1x21 =
21 u |
0.3 =
310 0.4 =
410 =
25 The number of scones and cupcakes is the same in the end. Make the number of scones and cupcakes in the end the same. LCM of 7 and 3 and 1 is 21.
Total number of scones and cupcakes at first
= 30 u + 35 u
= 65 u
65 u = 455
1 u = 455 ÷ 65 = 7
Number of scones that Zoe had left
= 21 u
= 21 x 7
= 147
Answer(s): 147
