The admission fee at a county fair is $2 for children and $4 dollars for adults. suppose that on the last day, 1600 people enter the fair and $5000 is collected. choose the two equations that can be solved as a system of equations to determine how many children and how many adults attended the fair. 1.) a-c=1600 2.) 4a+2c=5000 3.) 4a-2c=5000 4.) a+c=1600