Fanny made 275 macarons and biscuits. After she gave 0.9 of the macarons and 0.6 of the biscuits to her pupils, she was left with an equal number of macarons and biscuits. How many macarons had she left?
| |
Macarons |
Biscuits |
Before
|
10x2 =
20 u |
5x1 =
5 u |
Change
|
- 9x2 =
- 18 u |
- 3x1 =
- 3 u |
After
|
1x2 =
2 u |
2x1 =
2 u |
Comparing macarons and
biscuits in the end |
1x2 =
2 u |
1x2 =
2 u |
0.9 =
910 0.6 =
610 =
35 The number of macarons and biscuits is the same in the end. Make the number of macarons and biscuits in the end the same. LCM of 1 and 2 and 1 is 2.
Total number of macarons and biscuits at first
= 20 u + 5 u
= 25 u
25 u = 275
1 u = 275 ÷ 25 = 11
Number of macarons that Fanny had left
= 2 u
= 2 x 11
= 22
Answer(s): 22
