At the farm, the chicken population increased by 25% in the second month and then by a further 20% in the next 9 months. If there were 450 chickens in the end, how many chickens were there at the farm at first?
|
Chickens |
Before |
100% |
Change 1 |
+ 25% |
After 1 |
125% |
Change 2 |
+ 25% |
After 2 |
150% |
Population of chickens at first = 100%
New population of chickens after first increase
= 100% + 25%
= 125%
Percentage of second increase
= 20% x 125%
=
20100 x 125%
= 25%
New population of chickens after second increase
= 125% + 25%
= 150%
150% of chicken population = 450
1% of the chicken population
= 450 ÷ 150
= 3
100% of chicken population
= 100 x 3
= 300
Number of chickens at first = 300
Answer(s): 300