The number of chocolate chip cookies Bryan baked was
38 of the total number of cookies. After baking another 60 chocolate chip cookies, the number of chocolate chip cookies became
34 of the total number of cookies. How many cookies did she bake at first?
| |
Chocolate chip cookies |
Other cookies |
Total cookies |
| Before |
3 u |
5 u |
8 u |
| Change |
+ 60 |
|
|
| After |
3x5 =
15 u |
1x5 =
5 u |
4x5 =
20 u |
The number of other cookies remains unchanged. Make the number of other cookies the same. LCM of 5 and 1 is 5.
Number of more chocolate chip cookies baked
= 15 u - 3 u
= 12 u
12 u = 60
1 u = 60 ÷ 12 = 5
Number of cookies that Bryan baked at first
= 8 u
= 8 x 5
= 40
Answer(s): 40
