Price of Zoo Tickets

A certain zoo charges exactly twice as much for an adult admission ticket as 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 admission ticket?
A.)  $1.60
B.)  $2.10
C.)  $3.20
D.)  $3.30
E.)  $4.20

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x = price of child's admission ticket
2x = price of adult's admission ticket   {price of adult is twice the price of child}

2(2x) + 2x = 12.60   {2 adults and 2 children cost $12.60}
4x + 2x = 12.60   {multiplied 2 by 2x}
6x = 12.60   {combined like terms}
x = $2.10   {divided each side by 6}

price of child's admission ticket is
B.)  $2.10

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