Wendy made 550 puffs and cupcakes. After she gave 0.3 of the puffs and 0.6 of the cupcakes to her pupils, she was left with an equal number of puffs and cupcakes. How many puffs had she left?
| |
Puffs |
Cupcakes |
Before
|
10x2 =
20 u |
5x7 =
35 u |
Change
|
- 3x2 =
- 6 u |
- 3x7 =
- 21 u |
After
|
7x2 =
14 u |
2x7 =
14 u |
Comparing puffs and
cupcakes in the end |
1x14 =
14 u |
1x14 =
14 u |
0.3 =
310 0.6 =
610 =
35 The number of puffs and cupcakes is the same in the end. Make the number of puffs and cupcakes in the end the same. LCM of 7 and 2 and 1 is 14.
Total number of puffs and cupcakes at first
= 20 u + 35 u
= 55 u
55 u = 550
1 u = 550 ÷ 55 = 10
Number of puffs that Wendy had left
= 14 u
= 14 x 10
= 140
Answer(s): 140
