exam Maths Puzzle Numerical Ability

could someone help me solve this
x+5y=10
-2x-10y=-20

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exam Other Question

Translate the linear equation 9x - 4y = 200 and 7x - 3y = 200 to a real-life situation A carnival sells tickets for $2 each to adults and $1.50 each to children. If the carnival sold 500 tickets for a total price of $800, how many adults bought tickets?