Roshel baked 100 biscuits. 40% of them were blueberry biscuits. How many more blueberry biscuits must Roshel bake so that 85% of her biscuits are blueberry biscuits?
| |
Blueberry biscuits |
Other biscuits |
| Before |
40% |
60% |
| Change |
+ ? |
No change |
| After |
85 u |
15 u |
Number of blueberry biscuits at first
= 40% x 100
=
40100 x 100
= 40
Percentage of other biscuits
= 100% - 40%
= 60%
Number of other biscuits
= 60% x 100
=
60100 x 100
= 60
Number of other biscuits in the end
= 100 u - 85 u
= 15 u
The number of other biscuits remains unchanged.
60% = 15 u
15 u = 60
1 u = 60 ÷ 15 = 4
Number of blueberry biscuits in the end
= 85 u
= 85 x 4
= 340
Additional number of blueberry biscuits that Roshel must bake
= 340 - 40
= 300
Answer(s): 300
