Raeann baked 120 biscuits. 25% of them were matcha biscuits. How many more matcha biscuits must Raeann bake so that 85% of her biscuits are matcha biscuits?
| |
Matcha biscuits |
Other biscuits |
| Before |
25% |
75% |
| Change |
+ ? |
No change |
| After |
85 u |
15 u |
Number of matcha biscuits at first
= 25% x 120
=
25100 x 120
= 30
Percentage of other biscuits
= 100% - 25%
= 75%
Number of other biscuits
= 75% x 120
=
75100 x 120
= 90
Number of other biscuits in the end
= 100 u - 85 u
= 15 u
The number of other biscuits remains unchanged.
75% = 15 u
15 u = 90
1 u = 90 ÷ 15 = 6
Number of matcha biscuits in the end
= 85 u
= 85 x 6
= 510
Additional number of matcha biscuits that Raeann must bake
= 510 - 30
= 480
Answer(s): 480
