Question 143911
Okay, in the problem, Mary's and Dennis' wages are based on John. So let's assigned "x"= John's hourly wage. And Mary's age is twice that of John = "2x".
Also Dennis wage is 1/3 of John's rate= "1/3(x)", right?
Now, there's a condition that John's and Dennis' wages total $60 per hour. To show,
{{{x + 1/3(x) = $60/hr}}} right?  -------------- eqn 1
continuing,
{{{(3x+x)/3 =$60/hr}}}
{{{4x= $180/hr}}}
{{{x= $45/hr }}}---------- John's hourly rate
For Mary, "2x" = 2($45) = {{{$90/hr}}}
Also for Dennis, {{{1/3(x) =1/3($45) = $15/hr}}}
There you go,it shows Mary's wage {{{($90/hr)}}} is twice that of John's wage {{{($45/hr)}}}
Thank you,
Jojo