Question

Dr. Potter provides vaccinations against polio and measles. Each polio vaccination consists of 4 doses, and each measles vaccination consists of 2 doses. Last year, Dr. Potter gave a total of 60 vaccinations that consisted of a total of 184doses. How many polio vaccinations and how many measles vaccinations did Dr. Potter give last year?

Answer 1

Explanation:

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Answer 2

x - number of polio vaccinationsy - number of measles vaccinations:x + y = 60 / * ( - 2 )4 x + 2 y = 184
- 2 x - 2 y = - 120+4 x + 2 y = 184=2 x = 64x = 64 : 2x = 3232 + y = 60y = 60 - 32y = 28Answer: There were 32 polio and 28 measles vaccinations.