An amusement park sells adult tickets and children's tickets, with adults costing $5 and children's costing $3. if ed bought 15 tickets and spent a total of $57, how many children's tickets did he buy?

He bought 9 children's tickets.

Step-by-step explanation:

Let x be the no. of children's tickets.

Let y be the no. of adult tickets.

We are given that Ed bought 15 tickets

So,   --1

Cost of 1 child ticket = $3

Cost of x no. of children's tickets = 3x

Cost of 1 adult ticket = $5

Cost of y no. of adult's tickets = 5y

Since we are given that total cost is $57

So,   --- 2

Solving 1 and 2

Substitute the value of y from 1 in 2

So,

Hence he bought 9 children's tickets .

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step-by-step explanation: