Diana made 190 cookies and wafers. After she gave 0.3 of the cookies and 0.75 of the wafers to her friends, she was left with an equal number of cookies and wafers. How many wafers had she left?
| |
Cookies |
Wafers |
Before
|
10x1 =
10 u |
4x7 =
28 u |
Change
|
- 3x1 =
- 3 u |
- 3x7 =
- 21 u |
After
|
7x1 =
7 u |
1x7 =
7 u |
Comparing cookies and
wafers in the end |
1x7 =
7 u |
1x7 =
7 u |
0.3 =
310 0.75 =
75100 =
34 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 7 and 1 and 1 is 7.
Total number of cookies and wafers at first
= 10 u + 28 u
= 38 u
38 u = 190
1 u = 190 ÷ 38 = 5
Number of wafers that Diana had left
= 7 u
= 7 x 5
= 35
Answer(s): 35
