The number of apple cookies Ivan baked was
47 of the total number of cookies. After baking another 20 apple cookies, the number of apple cookies became
34 of the total number of cookies. How many cookies did she bake at first?
| |
Apple cookies |
Other cookies |
Total cookies |
| Before |
4 u |
3 u |
7 u |
| Change |
+ 20 |
|
|
| After |
3x3 =
9 u |
1x3 =
3 u |
4x3 =
12 u |
The number of other cookies remains unchanged. Make the number of other cookies the same. LCM of 3 and 1 is 3.
Number of more apple cookies baked
= 9 u - 4 u
= 5 u
5 u = 20
1 u = 20 ÷ 5 = 4
Number of cookies that Ivan baked at first
= 7 u
= 7 x 4
= 28
Answer(s): 28
