Răspuns :
(x*70° + 10*40°)/(x+10)=50°
70x+400=50x+500
20x = 100
x = 5 (litri)
Verificare:
( 5*70° + 400°)/(5+10) = 750°:15=50° (A)
70x+400=50x+500
20x = 100
x = 5 (litri)
Verificare:
( 5*70° + 400°)/(5+10) = 750°:15=50° (A)
(x*0,7+10*0,4)/(x+10)=0,5
0,7x+4=(x+10)*0,5
0,7x+4=0,5x+5
0,2x=1
x=1:0,2=10:2=5 litri
0,7x+4=(x+10)*0,5
0,7x+4=0,5x+5
0,2x=1
x=1:0,2=10:2=5 litri