Shannon baked a total of 425 wafers and biscuits. After giving away 80% of the biscuits and 75% of the wafers, she was left with twice as many biscuits as wafers. Find the number of wafers Shannon gave away.
| |
Biscuits |
Wafers |
| Before |
5x2 =
10 u
|
4 u |
| Change |
- 4x2 =
8 u |
- 3 u |
| After |
1x2 =
2 u |
1 u |
Comparing biscuits and
wafers in the end |
2x1 =
2 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 2 is 2.
Total number of pastries at first
= 10 u + 4 u
= 14 u
14 u = 425
1 u = 425 ÷ 14 = 6
Number of wafers that Shannon gave away
= 3 u
= 3 x 6
= 18
Answer(s): 18
