exam Maths Puzzle Numerical Ability

A construction agency pay equipment operators $134 a day and general laborer $90 a day. If thirty two people were hired and the payroll was $3848 how may equipment operators were employed? How man general laborers?

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I am trying to solve the following system: x+y =1 and x-y =1. thank you. what is the square root of five plus the square root of seventy five plus the square root of twenty seven