Every year 20 ducks from a flock are killed but another 30 are born.  The original flock size is 100 ducks.  After 5 years they join with another flock of 150 ducks.  How many ducks are in the combined flock?
Ҳар сол 20 ҳуттӣ аз як гуруҳ кушта мешаванд, аммо 30 ҳуттӣ дигар таваллуд мешаванд. Андозаи аслии гуруҳи ҳуттӣ 100 ҳуттӣ мебошад. Пас аз 5 сол, онҳо бо гуруҳи дигаре, ки 150 ҳуттӣ дорад, ҳамроҳ мешаванд. Чанд ҳуттӣ дар гуруҳи муттаҳидшуда ҳастанд?
How many ducks are added to the original flock each year? ** The original flock gains 30-20=<<30-20=10>>10 ducks per year
How many ducks are added to the original flock after 5 years? ** So after 5 years they have gained 10*5=<<10*5=50>>50 ducks
How many ducks are in the original flock? ** So the original flock has 100+50=<<100+50=150>>150 ducks
How many ducks are in the combined flock? ** So the combined flock has 150+150=<<150+150=300>>300 ducks
#### 300
How many ducks are added to the original flock each year? ** The original flock gains 30-20=<<30-20=10>>10 ducks per year  
How many ducks are added to the original flock after 5 years? ** So after 5 years they have gained 10*5=<<10*5=50>>50 ducks  
How many ducks are in the original flock? ** So the original flock has 100+50=<<100+50=150>>150 ducks  
How many ducks are in the combined flock? ** So the combined flock has 150+150=<<150+150=300>>300 ducks  
#### 300