Barbara made 66 wafers and puffs. After she gave 0.7 of the wafers and 0.75 of the puffs to her girls, she was left with an equal number of wafers and puffs. How many puffs had she left?
| |
Wafers |
Puffs |
Before
|
10x1 =
10 u |
4x3 =
12 u |
Change
|
- 7x1 =
- 7 u |
- 3x3 =
- 9 u |
After
|
3x1 =
3 u |
1x3 =
3 u |
Comparing wafers and
puffs in the end |
1x3 =
3 u |
1x3 =
3 u |
0.7 =
710 0.75 =
75100 =
34 The number of wafers and puffs is the same in the end. Make the number of wafers and puffs in the end the same. LCM of 3 and 1 and 1 is 3.
Total number of wafers and puffs at first
= 10 u + 12 u
= 22 u
22 u = 66
1 u = 66 ÷ 22 = 3
Number of puffs that Barbara had left
= 3 u
= 3 x 3
= 9
Answer(s): 9
