exam Maths Puzzle Numerical Ability

adult tickets for a play cost $5 and children tickets cost $2 for 1 person. 460 tickets were sold. Receipts were $1880. Find # of adult tickets sold. Please help me with this problem!

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exam Other Question

solve the system of equations:

4x-3y=8
2x+5y=-9

a.(-2,1)

b.(2,0)

c.(0,-83)

d.(1/2,-2) Can someone please help me with this problem too.
Write an equation in slope-intercept form that satisfies each condition.
passes through (2,-1) and is perpendicular to 3x-y=-3