Question

un calator parcurge un drum in trei zile.in prima zi parcurge 1/3 din drum ,in a doua zi 1/4 din drumul ramas ,iar in a treia zi 18km.ce lungime are tot drumul?

Answer 1

Notam lungimea drumul cu x
Prima zi:
(1/3) * x
Mai ramane x - (1/3)*x = (2/3)*x
A doua zi
(1/4)*(2/3)*x = (2/12)*x= (1/6)*x
Mai ramane
(2/3)*x-(1/6)*x= (2/3-1/6)*x = (4/6-1/6)*x=(3/6)*x=(1/2)*x
(1/2)*x=18 => x=2*18 => x=36km

Deci tot drumul are lungimea de 36 km

Answer 2

a + b + c = ? 
a = 1/3 din drum
b= 1/4 din drumul ramas 
c = 18km
d= drumul 

b= 18 x 4 =72 :2 = 36
a= 18 x 3 = 54 
c=18
......................
Suma = 144 : 4 = 36