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