Sabrina baked 80 puffs. 25% of them were matcha puffs. How many more matcha puffs must Sabrina bake so that 85% of her puffs are matcha puffs?
| |
Matcha puffs |
Other puffs |
| Before |
25% |
75% |
| Change |
+ ? |
No change |
| After |
85 u |
15 u |
Number of matcha puffs at first
= 25% x 80
=
25100 x 80
= 20
Percentage of other puffs
= 100% - 25%
= 75%
Number of other puffs
= 75% x 80
=
75100 x 80
= 60
Number of other puffs in the end
= 100 u - 85 u
= 15 u
The number of other puffs remains unchanged.
75% = 15 u
15 u = 60
1 u = 60 ÷ 15 = 4
Number of matcha puffs in the end
= 85 u
= 85 x 4
= 340
Additional number of matcha puffs that Sabrina must bake
= 340 - 20
= 320
Answer(s): 320
