Question

Afla a,b,c stiind ca a+b+c= 5680,stiimd ca a+b=4375,b-c= 234

Answer 1

$a + b + c = 5680 \\ a + b = 4375 \\ b - c = 234 \\ 4375 + c = 5680 \\ c = 5680 - 4375 \\ c = 1305 \\ b - 1305 = 234 \\ b = 234 + 1305 \\ b = 1539 \\ a + 1539 = 4375 \\ a = 4375 - 1539 \\ a = 2836$

Answer 2

a+b+c = 5680

a+b = 4375

b-c = 234

4375+c = 5680 => c = 5680-4375 => c = 1305

b-1305 = 234 => b = 234+1305 => b = 1539

a+1539 = 4375 => a = 4375-1539 => a = 2836

a+b+c = 2836+1539+1305 = 5680 , corect.