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browndarrell085
13.01.2021 •
Mathematics
The entry ticket to a local football game costs $10 for an adult and $5 for a child. A group of 100 people paid an entry fee of $710. How many adults and how many children were there in this group?
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Ответ:
Adults = 58
Children = 42
Step-by-step explanation:
Let adults be denoted as a
Let Children be denoted as c
a + c = 100 i
10a + 5c = 710 ii
Multiply I by 5
Multiply ii by 1
5a + 5c = 500 iii
10a + 5c = 710 iv
Subtract iii from iv
5a = 210
a = 210/5
a = 42
Since a + c = 100
c = 100 - 42 = 58.
Adults = 58
Children = 42
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