Question

Vă rog foarte mult!​

Answer 1

m=mama

f1=fiul cel mare

f2=fiul cel mic

m+f1+f2=45 (acum 5 ani)-> acum

m+5+f1+5+f2+5=45+5+5+5

f1=2×f2

m+2×f2+f2+15=45/-15

m+3×f2=30

m=f1+f2 (peste 18 ani)

m-18=f2×3-18×2

m-18=f2×3-36 /+18

m=f2×3-18

f2×3-18+3×f2=30

6×f2-18=30 /+18

6×f2=48 /÷6

f2=8 -> f1=2×8=16->

m=f1+f2+18

m=8+16+18

m=24+18

m= 42