Nora made 100 tarts and muffins. After she gave 0.9 of the tarts and 0.6 of the muffins to her children, she was left with an equal number of tarts and muffins. How many tarts had she left?
| |
Tarts |
Muffins |
Before
|
10x2 =
20 u |
5x1 =
5 u |
Change
|
- 9x2 =
- 18 u |
- 3x1 =
- 3 u |
After
|
1x2 =
2 u |
2x1 =
2 u |
Comparing tarts and
muffins in the end |
1x2 =
2 u |
1x2 =
2 u |
0.9 =
910 0.6 =
610 =
35 The number of tarts and muffins is the same in the end. Make the number of tarts and muffins in the end the same. LCM of 1 and 2 and 1 is 2.
Total number of tarts and muffins at first
= 20 u + 5 u
= 25 u
25 u = 100
1 u = 100 ÷ 25 = 4
Number of tarts that Nora had left
= 2 u
= 2 x 4
= 8
Answer(s): 8
