To find the costs of the adult and child tickets, we can start by setting up the relationship between them based on the information provided.
Let \( x \) be the cost of one adult ticket. Then the cost of one child ticket would be \( x - 3 \).
The total cost of three adult tickets and three child tickets can be expressed as:
\[ 3x + 3(x - 3) = 75 \]
Simplifying this equation:
\[ 3x + 3x - 9 = 75 \]
\[ 6x - 9 = 75 \]
Now, to isolate \( x \), we would first add 9 to both sides:
\[ 6x = 84 \]
Then divide by 6 to solve for \( x \):
\[ x = 14 \]
Then, we could find the cost of the child ticket as \( x - 3 \):
\[ x - 3 = 14 - 3 = 11 \]
Now, looking back at your options, let's evaluate them:
- Subtract 6 from 75 – This does not lead us directly to finding the costs.
- Divide 73 by 3 – This is not relevant as we need to use the total cost of 75.
- Add 3 to 75 – This step also does not directly help in finding the costs.
The first arithmetic step to solve for the ticket costs based on our setup is adding 9 to 75 to begin moving towards isolating 'x' after the initial expression, which is not listed in your provided options. The option that best leads us toward solving the equation setup we wrote would require additional steps, as none of your options directly help us isolate and solve for the ticket costs.
However, considering your options, a step that seems relevant in your list is actually to add 9 to 75 (though it's not directly listed, it's implied as part of the simplification).
If you strictly need to choose from the given options without adding a new one, I recommend revisiting the options or considering more suitable steps toward simplifying the costs directly from initial expressions.