Răspuns :
1.x-lungimea drumului
x/4 -in prima zi
x-x/4= (4x-x)/4= 3x/4-restul
3x/4/3= 3x/4 * 1/3= x/4 -in a2a zi
3x/4 -x/4= 2x/4 -noul rest
2x/4/2= 2x/4 *1/2= x/2 *1/2= x/4-in a3a zi
2x/4-x/4=x/4 -noul nou rest
x/4=50
x=4*50=200 km
2.x-nr de elevi
1/4 din x= x/4 -la mate
x-x/4= (4x-x)/4= 3x/4-restul
3x/4/4= 3x/4 * 1/4 =3x/16 -la informatica
3x/4-3x/16= (12x-3x)/16= 9x/16 -noul rest
9x/16=18
x=16*18/9
x=16*2=32 elevi
x/4 -in prima zi
x-x/4= (4x-x)/4= 3x/4-restul
3x/4/3= 3x/4 * 1/3= x/4 -in a2a zi
3x/4 -x/4= 2x/4 -noul rest
2x/4/2= 2x/4 *1/2= x/2 *1/2= x/4-in a3a zi
2x/4-x/4=x/4 -noul nou rest
x/4=50
x=4*50=200 km
2.x-nr de elevi
1/4 din x= x/4 -la mate
x-x/4= (4x-x)/4= 3x/4-restul
3x/4/4= 3x/4 * 1/4 =3x/16 -la informatica
3x/4-3x/16= (12x-3x)/16= 9x/16 -noul rest
9x/16=18
x=16*18/9
x=16*2=32 elevi
d=lungimea drumului
I - d/4
rest r1 (d-d/4=3/4*d)
II - r1/3
rest r2 (r1-r1/3=2/3*r1)
III - r2/2
rest r3= r2/2= 50 km ⇒ r2=100 km
r2=2/3*r1=100 km ⇒ r1=3*100/2=150 km
r1=3/4*d=150 km ⇒ d=150*4/3=200 km
2 x- nr de elevi
mate x/4
rest r1=3x/4
info r1/4
rest r2=3r1/4
cor r2=18=3r1/4 ⇒ r1=4*18/3=24
r1=3x/4=24⇒ x=4*24/3=32 elevi
I - d/4
rest r1 (d-d/4=3/4*d)
II - r1/3
rest r2 (r1-r1/3=2/3*r1)
III - r2/2
rest r3= r2/2= 50 km ⇒ r2=100 km
r2=2/3*r1=100 km ⇒ r1=3*100/2=150 km
r1=3/4*d=150 km ⇒ d=150*4/3=200 km
2 x- nr de elevi
mate x/4
rest r1=3x/4
info r1/4
rest r2=3r1/4
cor r2=18=3r1/4 ⇒ r1=4*18/3=24
r1=3x/4=24⇒ x=4*24/3=32 elevi