Math
posted by Lena .
I don't think I am understanding this question.
Question:
A zoo started with 16 cranes and panned to hatch 20 chicks. A few birds were kept for breeding and the rest realeased into the wild. At the end of last year, a total of 136 cranes had spent some time in the zoo. If the pattern continues, how many cranes will there be by the end of this year? the next year?
My thinking:
I don't know how many cranes they kept so I called that 'x'
I know they hatch 20 cranes a year so the number of years it took to get to 136 cranes would be 136/20 = 6.8 years
So by the end of the year would be 7 years so 20 x 7 = 140 cranes
So by the end of next year would be 140 + 20 = 160

planned to hatch 20 chicks a year* CORRECTION

The equation would actually be 16+(n1)(20) because they initially started off with 16 cranes so 16=a and they increase every year by 20 cranes so d=20 so plug the values into a+(n1)d. There would be 156 cranes at the end of this year and 176 by the next year.
Respond to this Question
Similar Questions

Math/modelling
Hi, I have a linear model with equation p =5.1t  28, which concerns breeding pairs of birds where p is the number of breeding pairs and t is the year. I need to use this model to estimate the number of breeding pairs in year 15. I … 
math
the trainers took a count of the animals at the zoo. there are both birds and four legged mammals at the zoo. the trainers counted 550 feet and 155 animals on their first trip through. How many birds and mammals are there? 
word problem(algebra)
on monday,Linus made 5k paper cranes&gave 2k paper cranes to his friends.on tuesday,he made another 4k paper cranes.his friend gave him 5 paper cranes.how many paper cranes does he have now in terms of k? 
AP Biology
Damaraland molerats are relatives of naked molerats. In their clans, too nonbreeding individuals of both sexes cooperatively assist one breeding par. Even so, breeding individuals in wild Damaraland molerat colonies usually are … 
Math
A Canadian zoo started with 16 whooping cranes and planned to hatch 20 chicks a year. A few birds were kept for breeding and the rest released into the wild. At the end of last year, a total of 136 cranes had spent some time in the … 
math
In a zoo, 21% of the animals are reptiles and 11% are birds. There are a total of 1,500 animals in the zoo. Which proportion can be solved for r, the number of reptiles in the zoo? 
main idea
This question is based on the following passage. Both Seagulls and wild geese are large birds. They're also similar in that both kinds of birds can fly over great distances. On the other hand, seagulls are scavengers, while wild geese … 
math
At a zoo, 1/3 of the animals are birds, 4/9 are mammals, and the rest are reptiles and amphibians. What fraction of animals at the zoo are reptiles and amphibians? 
Math
Ava made 100 paper cranes, and Brittany made34of the number of paper cranes Ava made. Ava gave920of her paper cranes to Brittany. Then, Brittany gave14of her paper cranes to Ava. How many more paper cranes did Brittany have than Ava … 
Math
Adam made 19 paper cranes Monday and 8 more Tuesday He gave 9 friends an equal number of cranes. How many cranes did each friend receive?