Marion made 266 tarts and cookies. After she gave 0.3 of the tarts and 0.75 of the cookies to her boys, she was left with an equal number of tarts and cookies. How many cookies had she left?
| |
Tarts |
Cookies |
Before
|
10x1 =
10 u |
4x7 =
28 u |
Change
|
- 3x1 =
- 3 u |
- 3x7 =
- 21 u |
After
|
7x1 =
7 u |
1x7 =
7 u |
Comparing tarts and
cookies in the end |
1x7 =
7 u |
1x7 =
7 u |
0.3 =
310 0.75 =
75100 =
34 The number of tarts and cookies is the same in the end. Make the number of tarts and cookies in the end the same. LCM of 7 and 1 and 1 is 7.
Total number of tarts and cookies at first
= 10 u + 28 u
= 38 u
38 u = 266
1 u = 266 ÷ 38 = 7
Number of cookies that Marion had left
= 7 u
= 7 x 7
= 49
Answer(s): 49
