Question

numerele a si b invers proportionale cu 5 si 8 iar a+b=26

Answer 1

5a = 8b = k 
a = k/5
b = k/8
a + b = 26 
 k/5 + k/8 =26   / x 40 
8k + 5k = 1040
13 k = 1040 
k = 1040 : 13  
 k=80

a = k/5 = > a=80/5 =>  a = 16
b = k/8 = > b=80/8 = > b = 10