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