Betty made 780 wafers and croissants. After she gave 0.1 of the wafers and 0.6 of the croissants to her children, she was left with an equal number of wafers and croissants. How many wafers had she left?
| |
Wafers |
Croissants |
Before
|
10x2 =
20 u |
5x9 =
45 u |
Change
|
- 1x2 =
- 2 u |
- 3x9 =
- 27 u |
After
|
9x2 =
18 u |
2x9 =
18 u |
Comparing wafers and
croissants in the end |
1x18 =
18 u |
1x18 =
18 u |
0.1 =
110 0.6 =
610 =
35 The number of wafers and croissants is the same in the end. Make the number of wafers and croissants in the end the same. LCM of 9 and 2 and 1 is 18.
Total number of wafers and croissants at first
= 20 u + 45 u
= 65 u
65 u = 780
1 u = 780 ÷ 65 = 12
Number of wafers that Betty had left
= 18 u
= 18 x 12
= 216
Answer(s): 216
