Gillian baked a total of 417 shortbreads and cookies. After giving away 75% of the cookies and 90% of the shortbreads, she was left with twice as many cookies as shortbreads. Find the number of shortbreads Gillian gave away.
| |
Cookies |
Shortbreads |
| Before |
4x2 =
8 u
|
10 u |
| Change |
- 3x2 =
6 u |
- 9 u |
| After |
1x2 =
2 u |
1 u |
Comparing cookies and
shortbreads in the end |
2x1 =
2 u |
1x1 =
1 u |
75% =
75100 =
3490% =
90100 =
910The number of cookies in the end is the repeated identity. Make the number of cookies in the end the same. LCM of 1 and 2 is 2.
Total number of pastries at first
= 8 u + 10 u
= 18 u
18 u = 417
1 u = 417 ÷ 18 = 10
Number of shortbreads that Gillian gave away
= 9 u
= 9 x 10
= 90
Answer(s): 90
