Va roggg rapidddd dau coroana!!

340+280+350=970(2M+2A+2D)
970:2=485(M+A+D)
485-340=145(Denisa)
485-280=205(Ancuta)
485-350=135(Maria)
Răspuns:
M+A=340c
M+D=280c
A+D=350c
A=340-M
M=280-D
=> A=340-280+D
=>60+2D=350
=>D=290:2=145
=>A=350-145=205
=>M=280-145=135