Elyse made 154 cookies and puffs. After she gave 0.7 of the cookies and 0.75 of the puffs to her pupils, she was left with an equal number of cookies and puffs. How many puffs had she left?
| |
Cookies |
Puffs |
Before
|
10x1 =
10 u |
4x3 =
12 u |
Change
|
- 7x1 =
- 7 u |
- 3x3 =
- 9 u |
After
|
3x1 =
3 u |
1x3 =
3 u |
Comparing cookies and
puffs in the end |
1x3 =
3 u |
1x3 =
3 u |
0.7 =
710 0.75 =
75100 =
34 The number of cookies and puffs is the same in the end. Make the number of cookies and puffs in the end the same. LCM of 3 and 1 and 1 is 3.
Total number of cookies and puffs at first
= 10 u + 12 u
= 22 u
22 u = 154
1 u = 154 ÷ 22 = 7
Number of puffs that Elyse had left
= 3 u
= 3 x 7
= 21
Answer(s): 21
