Two mechanics Worked on a car The first mechanic charge $55 per hour The second mechanic charge $80 per hour the mechanics work for a combin

Question

Two mechanics Worked on a car The first mechanic charge $55 per hour The second mechanic charge $80 per hour the mechanics work for a combined total of 15 hours and together they charged a total of $950 how long did the mechanic work?

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Gabriella 1 week 2021-09-14T23:18:17+00:00 1 Answer 0

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    2021-09-14T23:20:02+00:00

    a = hours worked by the first mechanic

    b = hours worked by the second mechanic.

    since the first mechanic charges $55 per hour, then for “a” hours that’d be a total of 55*a or 55a, likewise, for the second mechanic that’d be a total charge of 80*b or 80b.

    we know all hours combined are 15, so then a + b = 15.

    we also know that all charges combined are $950, so 55a + 80b = 950.

    \bf \begin{cases} a+b=15\\ \boxed{b}=15-a\\ \cline{1-1} 55a+80b=950 \end{cases}\qquad \qquad \stackrel{\textit{substituting on the 2nd equation}}{55a+80\left( \boxed{15-a} \right)=950} \\\\\\ 55a+1200-80a=950\implies -25a+1200=950\implies -25a=-250 \\\\\\ a=\cfrac{-250}{-25}\implies \blacktriangleright a = 10\blacktriangleleft \\\\\\ \stackrel{\textit{since we know that}}{b=15-a\implies }b=15-10\implies \blacktriangleright b=5 \blacktriangleleft

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