exam Maths Puzzle Numerical Ability

tickets $20 for singles and $35 for couples, Sales $2280 and 128 people, how many of each sold?

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exam Other Question

1.)Solve the system.
4x + 3y = 11
3x - 2y= 4
x=? y=?

2.)Jennifer has collected $4.50 in nickels and dimes. If she has 55 coins, how many of each kind of coin does she have? i dont understand how to complete the square on y=.5x^2-3x+19/2. i also have to graph this parabola and i dont know how