389 children and 224 adults were at the pool that day.
Step-by-step explanation:
Cost of one child ticket = $1.75
Cost of one adult ticket = $2.25
Total people = 613
Total receipts worth = $1184.75
Let,
Number of children = x
Number of adults = y
According to given statement;
x+y=613 Eqn 1
1.75x+2.25y=1184.75 Eqn 2
Multiplying Eqn 1 by 1.75
[tex]1.75(x+y=613)\\1.75x+1.75y=1072.75\ \ \ Eqn\ 3[/tex]
Subtracting Eqn 3 from Eqn 2
[tex](1.75x+2.25y)-(1.75x+1.75y)=1184.75-1072.75\\1.75x+2.25y-1.75x-1.75y=112.00\\0.50y=112.00[/tex]
Dividing both sides by 0.50
[tex]\frac{0.50y}{0.50}=\frac{112.00}{0.50}\\y=224[/tex]
Putting y=224 in Eqn 1
[tex]x+224=613\\x=613-224\\x=389\\[/tex]
389 children and 224 adults were at the pool that day.
Keywords: linear equation, subtraction
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