Fiona made 105 puffs and scones. After she gave 0.7 of the puffs and 0.6 of the scones to her pupils, she was left with an equal number of puffs and scones. How many puffs had she left?
| |
Puffs |
Scones |
Before
|
10x2 =
20 u |
5x3 =
15 u |
Change
|
- 7x2 =
- 14 u |
- 3x3 =
- 9 u |
After
|
3x2 =
6 u |
2x3 =
6 u |
Comparing puffs and
scones in the end |
1x6 =
6 u |
1x6 =
6 u |
0.7 =
710 0.6 =
610 =
35 The number of puffs and scones is the same in the end. Make the number of puffs and scones in the end the same. LCM of 3 and 2 and 1 is 6.
Total number of puffs and scones at first
= 20 u + 15 u
= 35 u
35 u = 105
1 u = 105 ÷ 35 = 3
Number of puffs that Fiona had left
= 6 u
= 6 x 3
= 18
Answer(s): 18
