<PRE><B>Question 1185896</B>
first and second mechanics
x and y, their time each
or
h, time for second mechanic @  $70 per hour
20-h, time for first mechanic @ $65 per hour


{{{70h+65(20-h)=1375}}}



{{{70h-65h+65*20=1375}}}

{{{(70-65)h=1375-65*20}}}

{{{h=(1375-(65)(20))/(70-65)}}}--------Simplify, compute this.


--

{{{h=(1375-1300)/5}}}

{{{h=75/5}}}

{{{highlight(h=15)}}}


check:  found h reproduce the $1375?
15 hours at $70/hr
5 hours at $65/hr
{{{15*70+5*65}}}
{{{1375}}}{{{yes}}}</PRE>