Question

a+b=840; a+b=642; b+c=553a;b;c;=?

Answer 1

a+b+c=840
a+b=642
b+c=553

642+c=840
c=840-642
c=198

a+553=840
a=840-553
a=287

b+198=553
b=553-198
b=355

Verificare: 287+198+355=840

Answer 2

a+b+c=840
a+b=642
642+c=840
c=840-642=198
c=198
b+c=553
b+198=553
b=553-198=355
b=355
a+355+198=840
a+553=840
a=840-553=287
a=287
287+355+198=840