The number of chocolate chip cupcakes Luke baked was
57 of the total number of cupcakes. After baking another 15 chocolate chip cupcakes, the number of chocolate chip cupcakes became
45 of the total number of cupcakes. How many cupcakes did she bake at first?
| |
Chocolate chip cupcakes |
Other cupcakes |
Total cupcakes |
| Before |
5 u |
2 u |
7 u |
| Change |
+ 15 |
|
|
| After |
4x2 =
8 u |
1x2 =
2 u |
5x2 =
10 u |
The number of other cupcakes remains unchanged. Make the number of other cupcakes the same. LCM of 2 and 1 is 2.
Number of more chocolate chip cupcakes baked
= 8 u - 5 u
= 3 u
3 u = 15
1 u = 15 ÷ 3 = 5
Number of cupcakes that Luke baked at first
= 7 u
= 7 x 5
= 35
Answer(s): 35
