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f-s=14 (+)
f+s=60
-------------
2f=74
f=37 remplazando f-s=14
37-s=14
S=37-14
S= 23
felipe= 37 y sonia =23
Felipe tiene: x-14
Ambas edades:<60
x-14+x<60
2x-14<60
2x<60+14
2x<74
x<74/2
x<37←Edad de Sonia.
<37-14=<23←Edad de Felipe.
Espero que sirva!Saludos!