Vanessa made 220 macarons and wafers. After she gave 0.7 of the macarons and 0.75 of the wafers to her boys, she was left with an equal number of macarons and wafers. How many wafers had she left?
| |
Macarons |
Wafers |
Before
|
10x1 =
10 u |
4x3 =
12 u |
Change
|
- 7x1 =
- 7 u |
- 3x3 =
- 9 u |
After
|
3x1 =
3 u |
1x3 =
3 u |
Comparing macarons and
wafers in the end |
1x3 =
3 u |
1x3 =
3 u |
0.7 =
710 0.75 =
75100 =
34 The number of macarons and wafers is the same in the end. Make the number of macarons and wafers in the end the same. LCM of 3 and 1 and 1 is 3.
Total number of macarons and wafers at first
= 10 u + 12 u
= 22 u
22 u = 220
1 u = 220 ÷ 22 = 10
Number of wafers that Vanessa had left
= 3 u
= 3 x 10
= 30
Answer(s): 30
