Question

Urgent!! Ofer 20 p.
Aflati x,y,z,t, stiind ca sunt invers proportionale cu numerele 1/2; 1/3; 0,4; 0,2 si ca suma lor este 5.

Answer 1

x*1/2=y*1/3=z*0,4=t*0,2=k
x=2k
y=3k
z=k/0,4=k: 4/10 = k*10/4=5k/2
t=10k/2
x+y+z+t=5
2k+3k+5k/2+10k/2=5
5k+5k/2+10k/2=5
aduc la acelasi numitor si apoi renunt la numitor
10k+15k=10
25k=10
k=10/25=2/5
x=2*2/5=4/5
y=3*2/5=6/5
z=5/2*2/5=1
t=10/2*2/5=2