Sarah made 260 tarts and macarons. After she gave 0.3 of the tarts and 0.4 of the macarons to her students, she was left with an equal number of tarts and macarons. How many tarts had she left?
| |
Tarts |
Macarons |
Before
|
10x3 =
30 u |
5x7 =
35 u |
Change
|
- 3x3 =
- 9 u |
- 2x7 =
- 14 u |
After
|
7x3 =
21 u |
3x7 =
21 u |
Comparing tarts and
macarons in the end |
1x21 =
21 u |
1x21 =
21 u |
0.3 =
310 0.4 =
410 =
25 The number of tarts and macarons is the same in the end. Make the number of tarts and macarons in the end the same. LCM of 7 and 3 and 1 is 21.
Total number of tarts and macarons at first
= 30 u + 35 u
= 65 u
65 u = 260
1 u = 260 ÷ 65 = 4
Number of tarts that Sarah had left
= 21 u
= 21 x 4
= 84
Answer(s): 84
