Question 316850
1.{{{F=P+2}}}
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{{{P=S+2}}}
2.{{{S=P-2}}}
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3.{{{F+P+S=63}}}
Substitute eq. 1 and eq. 2 into eq. 3,
{{{P+2+P+P-2=63}}}
{{{3P=63}}}
{{{P=21}}}
Then 
{{{F=P+2=23}}}
{{{S=P-2=19}}}
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Sam is 19, Pedro is 21, Fernando is 23