Erika made 110 macarons and biscuits. After she gave 0.7 of the macarons and 0.75 of the biscuits to her students, she was left with an equal number of macarons and biscuits. How many biscuits had she left?
| |
Macarons |
Biscuits |
Before
|
10x1 =
10 u |
4x3 =
12 u |
Change
|
- 7x1 =
- 7 u |
- 3x3 =
- 9 u |
After
|
3x1 =
3 u |
1x3 =
3 u |
Comparing macarons and
biscuits in the end |
1x3 =
3 u |
1x3 =
3 u |
0.7 =
710 0.75 =
75100 =
34 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 3 and 1 and 1 is 3.
Total number of macarons and biscuits at first
= 10 u + 12 u
= 22 u
22 u = 110
1 u = 110 ÷ 22 = 5
Number of biscuits that Erika had left
= 3 u
= 3 x 5
= 15
Answer(s): 15
