At the farm, the pig population increased by 20% in the second month and then by a further 25% in the next 2 months. If there were 600 pigs in the end, how many pigs were there at the farm at first?
| |
Pigs |
| Before |
100% |
| Change 1 |
+ 20% |
| After 1 |
120% |
| Change 2 |
+ 30% |
| After 2 |
150% |
Population of pigs at first = 100%
New population of pigs after first increase
= 100% + 20%
= 120%
Percentage of second increase
= 25% x 120%
=
25100 x 120%
= 30%
New population of pigs after second increase
= 120% + 30%
= 150%
150% of pig population = 600
1% of the pig population
= 600 ÷ 150
= 4
100% of pig population
= 100 x 4
= 400
Number of pigs at first = 400
Answer(s): 400
