Notam cu c- numarul cartilor si cu r - numarul rafturilor:
[tex]c = 30r+20[/tex]
[tex]c = 40(r-1)[/tex]
Ecuatia este:
[tex]40(r-1) = 30r+20 \iff 40r - 40 = 3r + 20 \iff 40r - 30r = 20 + 40\\[/tex]
[tex]10r = 60 \implies r = 6\\[/tex]
→ sunt 6 rafturi
[tex]c = 40(6 - 1) = 40 \cdot 5 = 200[/tex]
→ sunt 200 de carti
Show life that you have a thousand reasons to smile
© Copyright 2024 DOKU.TIPS - All rights reserved.
Notam cu c- numarul cartilor si cu r - numarul rafturilor:
[tex]c = 30r+20[/tex]
[tex]c = 40(r-1)[/tex]
Ecuatia este:
[tex]40(r-1) = 30r+20 \iff 40r - 40 = 3r + 20 \iff 40r - 30r = 20 + 40\\[/tex]
[tex]10r = 60 \implies r = 6\\[/tex]
→ sunt 6 rafturi
[tex]c = 40(6 - 1) = 40 \cdot 5 = 200[/tex]
→ sunt 200 de carti