Emily baked a total of 373 shortbreads and biscuits. After giving away 80% of the biscuits and 75% of the shortbreads, she was left with thrice as many biscuits as shortbreads. Find the number of shortbreads Emily gave away.
| |
Biscuits |
Shortbreads |
| Before |
5x3 =
15 u
|
4 u |
| Change |
- 4x3 =
12 u |
- 3 u |
| After |
1x3 =
3 u |
1 u |
Comparing biscuits and
shortbreads in the end |
3x1 =
3 u |
1x1 =
1 u |
80% =
80100 =
4575% =
75100 =
34The number of biscuits in the end is the repeated identity. Make the number of biscuits in the end the same. LCM of 1 and 3 is 3.
Total number of pastries at first
= 15 u + 4 u
= 19 u
19 u = 373
1 u = 373 ÷ 19 = 5
Number of shortbreads that Emily gave away
= 3 u
= 3 x 5
= 15
Answer(s): 15
