Siblings ages

The average age of the siblings Standy, Rado, and Patricia are ten years. Standa is twice as old as Rado, and Patricia is two years younger than Rado. Determine the age of each sibling.

Final Answer:

p =  6
r =  8
s =  16

Step-by-step explanation:


(s+r+p)/3=10
s = 2r
p = r-2

(s+r+p)/3=10
s = 2·r
p = r-2

p+r+s = 30
2r-s = 0
p-r = -2

Row 3 - Row 1 → Row 3
p+r+s = 30
2r-s = 0
-2r-s = -32

Row 3 + Row 2 → Row 3
p+r+s = 30
2r-s = 0
-2s = -32


s = -32/-2 = 16
r = 0+s/2 = 0+16/2 = 8
p = 30-r-s = 30-8-16 = 6

p = 6
r = 8
s = 16

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