Aunt Gillian made 80 less puffs than biscuits. After she gave 0.7 of the puffs and
25 of the biscuits to Lucy, she was left with 81 less puffs than biscuits. How many biscuits did she make?
| |
Puffs |
Biscuits |
Comparing puffs
and biscuits at first |
|
80 more |
Before |
10 u |
5x2 + 80 =
10 u + 80 |
Change |
- 7 u |
- 2x2 - 32 =
- 4 u - 32
|
After |
3 u |
3x2 + 48 =
6 u + 48 |
Comparing puffs
and biscuits in the end |
|
81 more |
0.7 =
710 25 x 80 = 32
Number of biscuits that Aunt Gillian gave to Lucy = 4 u + 32
If Aunt Gillian made another 81 puffs in the end, the number of puffs and biscuits in the end would be the same.
6 u + 48 = 3 u + 81
6 u - 3 u = 81 - 48
3 u = 33
1 u = 33 ÷ 3 = 11
Number of biscuits that Aunt Gillian made
= 10 u + 80
= 10 x 11 + 80
= 110 + 80
= 190
Answer(s): 190
