Lucy made 325 wafers and tarts. After she gave 0.1 of the wafers and 0.6 of the tarts to her children, she was left with an equal number of wafers and tarts. How many wafers had she left?
| |
Wafers |
Tarts |
Before
|
10x2 =
20 u |
5x9 =
45 u |
Change
|
- 1x2 =
- 2 u |
- 3x9 =
- 27 u |
After
|
9x2 =
18 u |
2x9 =
18 u |
Comparing wafers and
tarts in the end |
1x18 =
18 u |
1x18 =
18 u |
0.1 =
110 0.6 =
610 =
35 The number of wafers and tarts is the same in the end. Make the number of wafers and tarts in the end the same. LCM of 9 and 2 and 1 is 18.
Total number of wafers and tarts at first
= 20 u + 45 u
= 65 u
65 u = 325
1 u = 325 ÷ 65 = 5
Number of wafers that Lucy had left
= 18 u
= 18 x 5
= 90
Answer(s): 90
