Question

  Total,mama si fiul au impreuna 90 de ani. Total este mai in varsta decat mama cu5 ani, IAR mama cu 23 de ani decat fiul. Cati ani are foul?

Answer 1

m+t+f=90
t=m+5
m=f+23

t=m+5
t=f+23+5
t=f+28

f+23+f+28+f=90
3f+51=90
3f=90-51
3f=39
f=39:3
f=13 ani

tata=13+28
tata=41
mama=13+23
mama=36

Answer 2

                                        90-59=39
                                        39:3=13(fiul)
                                        13+28=41(tata)
                                        13+23=36(mama)
                                         V: 13+41+36=90
                                         R:90 ani