Gwen made 385 cookies and wafers. After she gave 0.1 of the cookies and 0.8 of the wafers to her girls, she was left with an equal number of cookies and wafers. How many cookies had she left?
| |
Cookies |
Wafers |
Before
|
10x1 =
10 u |
5x9 =
45 u |
Change
|
- 1x1 =
- 1 u |
- 4x9 =
- 36 u |
After
|
9x1 =
9 u |
1x9 =
9 u |
Comparing cookies and
wafers in the end |
1x9 =
9 u |
1x9 =
9 u |
0.1 =
110 0.8 =
810 =
45 The number of cookies and wafers is the same in the end. Make the number of cookies and wafers in the end the same. LCM of 9 and 1 and 1 is 9.
Total number of cookies and wafers at first
= 10 u + 45 u
= 55 u
55 u = 385
1 u = 385 ÷ 55 = 7
Number of cookies that Gwen had left
= 9 u
= 9 x 7
= 63
Answer(s): 63
