Asked by ali

Peter is three years older than his sister paula. If their combined age is 21 find their actual ages.

x+3=21
X+3-3=21-3
X=18

Answer=18 and 3
Answered by Ms. Sue
No,

x + x + 3 = 21

2x = 18

x = 9

Paula is 9 years old.
Answered by Anonymous
Your answer does not satisfy then condition that Peter is 3 years older than Paula.
Shouldn't your equation be
Paula --- x
Peter --- x+3

x + x+3 = 21
2x = 18
x = 9

So Paula is 9 and Peter is 12
Answered by Shane
(21-3)/2
18/2=9
9paula and Peter 9+3=12
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