Dana made 540 puffs and tarts. After she gave 0.3 of the puffs and 0.8 of the tarts to her friends, she was left with an equal number of puffs and tarts. How many puffs had she left?
| |
Puffs |
Tarts |
Before
|
10x1 =
10 u |
5x7 =
35 u |
Change
|
- 3x1 =
- 3 u |
- 4x7 =
- 28 u |
After
|
7x1 =
7 u |
1x7 =
7 u |
Comparing puffs and
tarts in the end |
1x7 =
7 u |
1x7 =
7 u |
0.3 =
310 0.8 =
810 =
45 The number of puffs and tarts is the same in the end. Make the number of puffs and tarts in the end the same. LCM of 7 and 1 and 1 is 7.
Total number of puffs and tarts at first
= 10 u + 35 u
= 45 u
45 u = 540
1 u = 540 ÷ 45 = 12
Number of puffs that Dana had left
= 7 u
= 7 x 12
= 84
Answer(s): 84
