exam Maths Puzzle Numerical Ability

Translate the linear equation 9x - 4y = 200 and 7x - 3y = 200 to a real-life situation

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exam Other Question

In the period of a year, an investor lost twice as much as he gained. If he originally had $10,000 and now has $8000, what amount did he gain and what did he lose? could someone help me solve this
x+5y=10
-2x-10y=-20