Emma baked a total of 362 macarons and biscuits. After giving away 80% of the biscuits and 90% of the macarons, she was left with four times as many biscuits as macarons. Find the number of macarons Emma gave away.
| |
Biscuits |
Macarons |
| Before |
5x4 =
20 u
|
10 u |
| Change |
- 4x4 =
16 u |
- 9 u |
| After |
1x4 =
4 u |
1 u |
Comparing biscuits and
macarons in the end |
4x1 =
4 u |
1x1 =
1 u |
80% =
80100 =
4590% =
90100 =
910The number of biscuits in the end is the repeated identity. Make the number of biscuits in the end the same. LCM of 1 and 4 is 4.
Total number of pastries at first
= 20 u + 10 u
= 30 u
30 u = 362
1 u = 362 ÷ 30 = 7
Number of macarons that Emma gave away
= 9 u
= 9 x 7
= 63
Answer(s): 63
