Question

stiin ca a:b+c:b=7, iar a+c=56,b?

Answer 1

a/b+c/b=7
a+c=56=> a=56-c
inlocuiesti pe a si vine
(56-c)/b+c/b=7
(56-c+c)/b=7
56/b=7 => 7b=56=> b=8

Answer 2

a:b+c:b=7<=>a/b+c/b=7=>a+c=7b {a+c=7b| {a+c=56|=> =>7b=56=>b=8