Ticket prices

A certain zoo charges twice as much for an adult admission ticket as for a child's admission ticket.  If the total admission price for the family of two adults and two children is $12.60, what is the price of a child's ticket?
A.)  $1.60
B.)  $2.10
C.)  $3.20
D.)  $3.30
E.)  $4.20

x = cost of child's ticket
2x = cost of adult's ticket {adult admission is twice as much as child's}

2(x) + 2(2x) = 12.60 {total price for 2 adults and 2 children is 12.60}
2x + 4x = 12.60 {multiplied through on left side}
6x = 12.60 {combined like terms on left side}
x = 2.10 {divided both sides by 6}

child's ticket price = $2.10

B.)  $2.10

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