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x+5 -druga liczba |10+5=15
0.8(x+5) -trzecia liczba |0.8(10+5)=0.8x15=12
x+x+5+0.8(x+5)=37 |10+15+12=37
x+x+5+0.8x+4=37
2.8x=28/:2.8
x=10
Odp.Pierwsza liczba to 10,druga 15, trzecia 12.
a+b+c=37
b=5+a
c=80%b
a+5+a+c=37
2a+c=32
c=32-2a
c=32-2b+10
c=42-2b
c=42-2c/0,8
c+2c/0,8=42
0,8c/0,8+2c/0,8=42
2,8c/0,8=42
3,5c=42
c=12
b=12/0,8
b=15
a+b+c=37
a=37-15-12
a=10