At the farm, the cow population increased by 20% in the second month and then by a further 10% in the next 6 months. If there were 924 cows in the end, how many cows were there at the farm at first?
|
Cows |
Before |
100% |
Change 1 |
+ 20% |
After 1 |
120% |
Change 2 |
+ 12% |
After 2 |
132% |
Population of cows at first = 100%
New population of cows after first increase
= 100% + 20%
= 120%
Percentage of second increase
= 10% x 120%
=
10100 x 120%
= 12%
New population of cows after second increase
= 120% + 12%
= 132%
132% of cow population = 924
1% of the cow population
= 924 ÷ 132
= 7
100% of cow population
= 100 x 7
= 700
Number of cows at first = 700
Answer(s): 700