Tiffany made 220 puffs and wafers. After she gave 0.7 of the puffs and 0.75 of the wafers to her friends, she was left with an equal number of puffs and wafers. How many wafers had she left?
| |
Puffs |
Wafers |
Before
|
10x1 =
10 u |
4x3 =
12 u |
Change
|
- 7x1 =
- 7 u |
- 3x3 =
- 9 u |
After
|
3x1 =
3 u |
1x3 =
3 u |
Comparing puffs and
wafers in the end |
1x3 =
3 u |
1x3 =
3 u |
0.7 =
710 0.75 =
75100 =
34 The number of puffs and wafers is the same in the end. Make the number of puffs and wafers in the end the same. LCM of 3 and 1 and 1 is 3.
Total number of puffs and wafers at first
= 10 u + 12 u
= 22 u
22 u = 220
1 u = 220 ÷ 22 = 10
Number of wafers that Tiffany had left
= 3 u
= 3 x 10
= 30
Answer(s): 30
