Question

Raspunsul exercitului incercuit si metoda de rezolvare ; imi trebuie repede!
Multumesc anticipat !

Answer 1

a + b + c = 680 
a + 50a/100 = a + a/2 = 3a/2 
b - 25b/100 = b - b/4 = 3b/4 
c - 5 
3a/2 = 3b/4 = c-5  = > k 

2k/3 + 4k/3 +(k+5) = 680  / x3
2k + 4k + 3k + 15 = 2040
9k = 2040 - 15
9k= 2025 
k = 2025 : 9
k = 225 

a = 2 x 225/ 3 = 450/3 = 150 
b= 4 x 225/3 =  900/3 = 300
c = 225 +5 = 230