exam Maths Puzzle Numerical Ability

Solve by the elimination method
4x-8y=1
4x-8y=2

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exam Other Question

An art dealer sold two artworks for $1520 therby making a profit of 25% on the first work and 10% profit on the other, whereas if he approached any exhibition he would have sold th log 10 x + log 10 y..... y = 3 then xy=