Xuan made 110 wafers and scones. After she gave 0.3 of the wafers and 0.6 of the scones to her children, she was left with an equal number of wafers and scones. How many wafers had she left?
| |
Wafers |
Scones |
Before
|
10x2 =
20 u |
5x7 =
35 u |
Change
|
- 3x2 =
- 6 u |
- 3x7 =
- 21 u |
After
|
7x2 =
14 u |
2x7 =
14 u |
Comparing wafers and
scones in the end |
1x14 =
14 u |
1x14 =
14 u |
0.3 =
310 0.6 =
610 =
35 The number of wafers and scones is the same in the end. Make the number of wafers and scones in the end the same. LCM of 7 and 2 and 1 is 14.
Total number of wafers and scones at first
= 20 u + 35 u
= 55 u
55 u = 110
1 u = 110 ÷ 55 = 2
Number of wafers that Xuan had left
= 14 u
= 14 x 2
= 28
Answer(s): 28
