Question 1151216
let the amount of dollars that Susan have be {{{x}}}, Alonzo {{{y}}}, and Joe {{{z}}}

if Susan, Alonzo, and Joe have a total of ${{{70}}} dollars in their wallet, than

{{{x+y+z=70}}}........eq.1

if Alonzo has ${{{6}}} less than Susan, than

{{{y=x-6}}}.......eq.2

 Joe has {{{2}}} times what Alonzo has, we have

 {{{z=2y}}}...........substitute {{{y}}} from eq.2

{{{z=2(x-6)}}}.......eq.3

go back to

{{{x+y+z=70}}}........eq.1 substitute {{{y}}} from eq.2 and  {{{z}}} from eq.3

{{{x+(x-6)+2(x-6)=70}}}..........solve for {{{x}}}

{{{x+x-6+2x-12=70}}}

{{{4x-18=70}}}

{{{4x=70+18}}}

{{{4x=88}}}

{{{x=22}}}


go to

{{{y=x-6}}}.......eq.2, substitute {{{x}}}

{{{y=22-6}}}

{{{y=16}}}


go to

{{{z=2(x-6)}}}.......eq.3, substitute {{{x}}}

{{{z=2(22-6)}}}
{{{z=2(16)}}}

{{{z=32}}}

so, 
Susan has  {{{22}}} dollars in her wallet
Alonzo has {{{16}}} dollars in his wallet
 Joe has {{{32}}} dollars in his wallet