Fiona baked 40 scones. 25% of them were strawberry scones. How many more strawberry scones must Fiona bake so that 90% of her scones are strawberry scones?
| |
Strawberry scones |
Other scones |
| Before |
25% |
75% |
| Change |
+ ? |
No change |
| After |
90 u |
10 u |
Number of strawberry scones at first
= 25% x 40
=
25100 x 40
= 10
Percentage of other scones
= 100% - 25%
= 75%
Number of other scones
= 75% x 40
=
75100 x 40
= 30
Number of other scones in the end
= 100 u - 90 u
= 10 u
The number of other scones remains unchanged.
75% = 10 u
10 u = 30
1 u = 30 ÷ 10 = 3
Number of strawberry scones in the end
= 90 u
= 90 x 3
= 270
Additional number of strawberry scones that Fiona must bake
= 270 - 10
= 260
Answer(s): 260
