A fifth-grade class went on a field trip to the zoo, and their class of 10 students merged with another class with the same amount of students. 5 parents offered to be a chaperone, and 2 of the teachers from both classes will be there too. When the school day was over, the students could choose to go home and 10 of them left. Two of the chaperones were parents in that group, so they left as well. How many individuals were left at the zoo?
A total of 10*2=<<10*2=20>>20 students went on the field trip.
Some chaperones showed up, letting the group grow to 20+5=<<20+5=25>>25 individuals.
The teachers had to come as well, making the group as big as 25+2=<<25+2=27>>27 individuals.
When the school day ended, 27-10=<<27-10=17>>17 individuals were left.
A couple of chaperones followed suit, leaving 17-2=<<17-2=15>>15 people at the zoo.
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Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
You are solving math problems. Here are some examples of how to solve the task:

Vinnie is writing an essay and needs to make sure that he has not exceeded the 1000-word limit. He wrote 450 words on Saturday and 650 words on Sunday. How many words has Vinnie exceeded the limit by?Vinnie has written a total of 450 words on Saturday + 650 words on Sunday = <<450+650=1100>>1100 words.
He has therefore exceeded the limit by 1100 written words – 1000 word limit = <<1100-1000=100>>100 words.
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Sally teaches elementary school and is given $320 to spend on books for her students. A reading book costs $12 and there are 30 students in her class. Unfortunately, if the money she is given by the school to pay for books is not sufficient, she will need to pay the rest out of pocket. How much money does Sally need to pay out of pocket, to buy every student a reading book?To purchase a book for each student, Sally needs: 30 x $12 = $<<30*12=360>>360.
She thus needs to pay $360 - $320 = $<<360-320=40>>40 out of pocket.
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Now, solve this next question in the style of the above examples:

A fifth-grade class went on a field trip to the zoo, and their class of 10 students merged with another class with the same amount of students. 5 parents offered to be a chaperone, and 2 of the teachers from both classes will be there too. When the school day was over, the students could choose to go home and 10 of them left. Two of the chaperones were parents in that group, so they left as well. How many individuals were left at the zoo?

### Response:
A total of 10*2=<<10*2=20>>20 students went on the field trip.
Some chaperones showed up, letting the group grow to 20+5=<<20+5=25>>25 individuals.
The teachers had to come as well, making the group as big as 25+2=<<25+2=27>>27 individuals.
When the school day ended, 27-10=<<27-10=17>>17 individuals were left.
A couple of chaperones followed suit, leaving 17-2=<<17-2=15>>15 people at the zoo.
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