Question 629796
Alex has twice as much money as Jennifer.
 a = 2j
: 
 Jennifer has $6 less than Shannon.
 j = s-6
 j+6 = s
;
 All together the three friends have $54.
 a + j + s = 54
Replace a and s
2j + j + (j+6) = 54
4j = 54 - 6
4j = 48
j = 48/4
j = 12 is Jen's age
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You can find the ages of the other two, ensure they add up to 54

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