At the farm, the chicken population increased by 20% in the second month and then by a further 25% in the next 10 months. If there were 900 chickens in the end, how many chickens were there at the farm at first?
|
Chickens |
Before |
100% |
Change 1 |
+ 20% |
After 1 |
120% |
Change 2 |
+ 30% |
After 2 |
150% |
Population of chickens at first = 100%
New population of chickens after first increase
= 100% + 20%
= 120%
Percentage of second increase
= 25% x 120%
=
25100 x 120%
= 30%
New population of chickens after second increase
= 120% + 30%
= 150%
150% of chicken population = 900
1% of the chicken population
= 900 ÷ 150
= 6
100% of chicken population
= 100 x 6
= 600
Number of chickens at first = 600
Answer(s): 600