Bob and fred together make $20.00 a week less than double john. john makes $110.00 a week and bob makes $140.00 a week. how much does fred make? answer

Fred makes $60/week.

Step-by-step explanation:

Fred makes f dollars per week, john j dollars and bob b dollars.

Then b = $140/week; j = $110/week; and b + f = 2j - 20.

Substitute $140/week for b in this equation; also substitute $110/week for j.  Then:  

    $140/week + f = 2($110) - $20.  There's only one variable here, f, so we're ready to solve for f:

    $140/week + f = $220/week - $20/week,   or:

     $140/week + f = $200/week

Subtract $140 from both sides, obtaining:

f = $60

Fred makes $60/week.

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step-by-step explanation:

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