Question

Daca numerele x si y sunt direct proportionale cu 2 si 5,aflati cat la suta reprezinta x din y

Answer 1

x/2=y/5=k

x/2=k

y/5=k

x/2=y/5<=>5x=2y=>x=2y/5

y...................100%

2y/5.....................x%

x=2y*100/100/5/y=0,4=>x=40%y

Answer 2

x/2=y/5

5x=2y

5x/y=2

x/y=2/5

x/y=0,4     ⇒    x/y=40%