Question

1/4 din drum e parcurs in prima zi,a doua zi 1/2 din rest ,iar a treia zi raman 25 km .cat este tot drumul

Answer 1

tot drumul:
|______|______|______|______|
prima zi:
|______|

rest |__________|_________|
a 2-a zi
|___________|

a 3-a zi |___________| 25 km
25 + 25 = 50 (rest)
50 : 3 = 16,(6)
16,(6)×4 = (166-16)/9×4 = 150×4/9 = 600:9 = 66,(6) km (tot drumul)

sau
x = tot drumul parcurs
x/4 +1/2(3x/4)+25 = x
x/4+3x/8+25 = x |×8
2x + 3x + 200 = 8x
3x =200
x = 66,(6) km

Answer 2

1) x/4  ;    x-x/4 =3x/4  rest
2)1/2*3x/4 =3x/8
3)25 km

x/4+3x/8 +25 =x   numitor 8
2x+3x+200 =8x
8x-2x-3x =200
3x =200
x =66.66 km