Hazel made 420 puffs and wafers. After she gave 0.9 of the puffs and 0.4 of the wafers to her students, she was left with an equal number of puffs and wafers. How many puffs had she left?
| |
Puffs |
Wafers |
Before
|
10x3 =
30 u |
5x1 =
5 u |
Change
|
- 9x3 =
- 27 u |
- 2x1 =
- 2 u |
After
|
1x3 =
3 u |
3x1 =
3 u |
Comparing puffs and
wafers in the end |
1x3 =
3 u |
1x3 =
3 u |
0.9 =
910 0.4 =
410 =
25 The number of puffs and wafers is the same in the end. Make the number of puffs and wafers in the end the same. LCM of 1 and 3 and 1 is 3.
Total number of puffs and wafers at first
= 30 u + 5 u
= 35 u
35 u = 420
1 u = 420 ÷ 35 = 12
Number of puffs that Hazel had left
= 3 u
= 3 x 12
= 36
Answer(s): 36
