Seventeen concert tickets were sold for $550. Each adult ticket costs $9 and each children's ticket costs $5 find the number of adult tickets and the number of children's tickets sold

The number of adult's ticket is 50.

The number of children's ticket is 20.

Step-by-step explanation:

Given that, seventy ticket were sold for $550.

Let the number of adult's ticket be x.

Then the number of children's tickets is = (70-x)

Each adult ticket cost $9.

Then the cost of x number of adult's ticket is = $9x

Each children's ticket cost $5

Then the cost of (17-x) number of children's ticket is=$5(70-x)

                                                                                     =$(350-5x)

According to the problem,

The number of adult's ticket is 50.

The number of children's ticket is (70-50)=20

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.