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