Elyse made 132 tarts and wafers. After she gave 0.7 of the tarts and 0.75 of the wafers to her pupils, she was left with an equal number of tarts and wafers. How many wafers had she left?
| |
Tarts |
Wafers |
Before
|
10x1 =
10 u |
4x3 =
12 u |
Change
|
- 7x1 =
- 7 u |
- 3x3 =
- 9 u |
After
|
3x1 =
3 u |
1x3 =
3 u |
Comparing tarts and
wafers in the end |
1x3 =
3 u |
1x3 =
3 u |
0.7 =
710 0.75 =
75100 =
34 The number of tarts and wafers is the same in the end. Make the number of tarts and wafers in the end the same. LCM of 3 and 1 and 1 is 3.
Total number of tarts and wafers at first
= 10 u + 12 u
= 22 u
22 u = 132
1 u = 132 ÷ 22 = 6
Number of wafers that Elyse had left
= 3 u
= 3 x 6
= 18
Answer(s): 18
