Nora made 135 shortbreads and muffins. After she gave 0.3 of the shortbreads and 0.8 of the muffins to her friends, she was left with an equal number of shortbreads and muffins. How many shortbreads had she left?
| |
Shortbreads |
Muffins |
Before
|
10x1 =
10 u |
5x7 =
35 u |
Change
|
- 3x1 =
- 3 u |
- 4x7 =
- 28 u |
After
|
7x1 =
7 u |
1x7 =
7 u |
Comparing shortbreads and
muffins in the end |
1x7 =
7 u |
1x7 =
7 u |
0.3 =
310 0.8 =
810 =
45 The number of shortbreads and muffins is the same in the end. Make the number of shortbreads and muffins in the end the same. LCM of 7 and 1 and 1 is 7.
Total number of shortbreads and muffins at first
= 10 u + 35 u
= 45 u
45 u = 135
1 u = 135 ÷ 45 = 3
Number of shortbreads that Nora had left
= 7 u
= 7 x 3
= 21
Answer(s): 21
