Question

Aflati a,b,c stiind ca sunt proportionale cu 0,5;0,2;0,(3) si a+b+c=930.


IMIO TREBUIE RASPUNSUL ACUM!!!DAU CORONITA!!!!

Answer 1

a+b+c =930
0.5 =5/10 =1/2
0.2 =2/10 =1/5
0.(3) =3/9 =1/3

a              b         c
---  =    -------  = -----   =   K
1/2        1/5        1/3

a  
---  =  k   ;    a =k/2
1/2
b
----  =k      ;  b =k/5
1/5

c
----  =k   ;   c =k/3
1/3 
 

k/2+k/5+k/3 =930     numitor  30
15k+6k+10k =27900
31k =27900
k =900

a =k/2 =900/2 = 450
b =k/5 =900/5 =180
c =k/3 =900/3 =300
v  ;  450+180+300 =930