Question

Stiind ca a + c = 215 si b + d = 115 , aflati a - b + c - d .

Answer 1

[tex](a+c)-(b+d)=215-115 [/tex]
$a-b+c-d=100$
Succes!!!:)))

Answer 2

a-b+c-d=a+c-1(b+d)=215-115=100