SOLUTION: Mina has 5 more marbles than Kirsty. Kirsty has 2 more marbles than Seb . Altogether they have 30 marbles. how many marbles does each child have.

Question 952484: Mina has 5 more marbles than Kirsty. Kirsty has 2 more marbles than Seb . Altogether they have 30 marbles. how many marbles does each child have.

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Mina has 5 more marbles than Kirsty. Kirsty has 2 more marbles than Seb . Altogether they have 30 marbles. how many marbles does each child have.
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Equations:
m = k + 5
k = s + 2
m + k + s = 30
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Substitute for "m" and for "s"::
k+5 + k + k-2 = 30
3k +3 = 30
3k = 27
Kirsty has 9 marbles
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Mina has 9+5 = 14 marbles
Seb has 9-2 = 7 marbles
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Cheers,
Stan H.
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