SOLUTION: 3 children have 30 marbles between them. Milee has 5 more than Kirsty who has 2 more than Seb. How many do they have each?

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Question 1022296: 3 children have 30 marbles between them. Milee has 5 more than Kirsty who has 2 more than Seb. How many do they have each?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
M%2BK%2BS=30
M=K%2B5
K=S%2B2
Substituting,
K%2B5%2BK%2BS=30
2K%2BS=25
Substituting again,
2%28S%2B2%29%2BS=25
2S%2B4%2BS=25
3S=21
S=7
K=7%2B2=9
M=9%2B5=14