gungun1 gungun1

31-03-2016
Mathematics

Answered

Mina has 5 more marbels than Kirsty

Kirsty has 2 more than seb

Alltogether there are 30

How man marbels does each child have

Show your working out

Mina. Kirsty. Seb

? ? ?

Verified Answer :

babytacos babytacos

31-03-2016

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

---
Mina has 9+5 = 14 marbles
Seb has 9-2 = 7 marbles

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