Question 636182
Alex has twice as much money as Jennifer. Jennifer has $6 less than Shannon. Togethere they have $54. How much money does each have?
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Equations:
a = 2j
j = s - 6
a + j + s = 54
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Substitute for a and "s" and solve for "j:
2j + j + j+6 = 54
4j = 48
jennifer has $12
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a = 2j
Alex has 2*12 = $24
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s = j+6 = 12+6 
Shannon has $18
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Cheers,
Stan H.