Abi baked a total of 466 tarts and cookies. After giving away 90% of the cookies and 80% of the tarts, she was left with twice as many cookies as tarts. Find the number of tarts Abi gave away.
| |
Cookies |
Tarts |
| Before |
10x2 =
20 u
|
5 u |
| Change |
- 9x2 =
18 u |
- 4 u |
| After |
1x2 =
2 u |
1 u |
Comparing cookies and
tarts in the end |
2x1 =
2 u |
1x1 =
1 u |
90% =
90100 =
91080% =
80100 =
45The 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
= 20 u + 5 u
= 25 u
25 u = 466
1 u = 466 ÷ 25 = 3
Number of tarts that Abi gave away
= 4 u
= 4 x 3
= 12
Answer(s): 12
