Diana baked 40 croissants. 25% of them were chocolate croissants. How many more chocolate croissants must Diana bake so that 85% of her croissants are chocolate croissants?
| |
Chocolate croissants |
Other croissants |
| Before |
25% |
75% |
| Change |
+ ? |
No change |
| After |
85 u |
15 u |
Number of chocolate croissants at first
= 25% x 40
=
25100 x 40
= 10
Percentage of other croissants
= 100% - 25%
= 75%
Number of other croissants
= 75% x 40
=
75100 x 40
= 30
Number of other croissants in the end
= 100 u - 85 u
= 15 u
The number of other croissants remains unchanged.
75% = 15 u
15 u = 30
1 u = 30 ÷ 15 = 2
Number of chocolate croissants in the end
= 85 u
= 85 x 2
= 170
Additional number of chocolate croissants that Diana must bake
= 170 - 10
= 160
Answer(s): 160
