At the farm, the cow population increased by 30% in the second month and then by a further 20% in the next 6 months. If there were 624 cows in the end, how many cows were there at the farm at first?
|
Cows |
Before |
100% |
Change 1 |
+ 30% |
After 1 |
130% |
Change 2 |
+ 26% |
After 2 |
156% |
Population of cows at first = 100%
New population of cows after first increase
= 100% + 30%
= 130%
Percentage of second increase
= 20% x 130%
=
20100 x 130%
= 26%
New population of cows after second increase
= 130% + 26%
= 156%
156% of cow population = 624
1% of the cow population
= 624 ÷ 156
= 4
100% of cow population
= 100 x 4
= 400
Number of cows at first = 400
Answer(s): 400