Betty made 380 macarons and shortbreads. After she gave 0.3 of the macarons and 0.75 of the shortbreads to her friends, she was left with an equal number of macarons and shortbreads. How many shortbreads had she left?
| |
Macarons |
Shortbreads |
Before
|
10x1 =
10 u |
4x7 =
28 u |
Change
|
- 3x1 =
- 3 u |
- 3x7 =
- 21 u |
After
|
7x1 =
7 u |
1x7 =
7 u |
Comparing macarons and
shortbreads in the end |
1x7 =
7 u |
1x7 =
7 u |
0.3 =
310 0.75 =
75100 =
34 The number of macarons and shortbreads is the same in the end. Make the number of macarons and shortbreads in the end the same. LCM of 7 and 1 and 1 is 7.
Total number of macarons and shortbreads at first
= 10 u + 28 u
= 38 u
38 u = 380
1 u = 380 ÷ 38 = 10
Number of shortbreads that Betty had left
= 7 u
= 7 x 10
= 70
Answer(s): 70
