Yen made 450 croissants and macarons. After she gave 0.3 of the croissants and 0.8 of the macarons to her pupils, she was left with an equal number of croissants and macarons. How many croissants had she left?
| |
Croissants |
Macarons |
Before
|
10x1 =
10 u |
5x7 =
35 u |
Change
|
- 3x1 =
- 3 u |
- 4x7 =
- 28 u |
After
|
7x1 =
7 u |
1x7 =
7 u |
Comparing croissants and
macarons in the end |
1x7 =
7 u |
1x7 =
7 u |
0.3 =
310 0.8 =
810 =
45 The number of croissants and macarons is the same in the end. Make the number of croissants and macarons in the end the same. LCM of 7 and 1 and 1 is 7.
Total number of croissants and macarons at first
= 10 u + 35 u
= 45 u
45 u = 450
1 u = 450 ÷ 45 = 10
Number of croissants that Yen had left
= 7 u
= 7 x 10
= 70
Answer(s): 70
