Question

aflati a,b,c, stiind ca sunt direct proportionale cu 2 ,5, 8 iar 3a+5b-2=45

Answer 1

a/2=b/5=c/8
b=5a/2
c=8a/2=4a
3a+5b-2c=45
3a+5*5a/2-2*4a=45
6a+25a-16a=90
15a=90
a=6
b=5*6/2=15
c=4*6=24