Question

Ion parcurge cu autocarul un drum in 3 zile. In prima zi a parcurs 20% din drum in a doua zi 30% din rest si in a treia zi ultimii 560 de kilometri din drum. Determinati lungimea drumului parcurs de ion in 3zile

Answer 1

prima zi⇒x/5;
a ramas x-x/5=5x/5-x/5=4x/5;
a doua zi⇒30/100 ·4x/5=6/25 ·x/1=6x/25;
a ramas 4x/5-6x/25=20x/25-6x/25=14x/25;
a treia zi⇒14x/25=560
⇒x=25·560/14=25·40=1000[km-lungimea drumului parcurs de Ion];

Answer 2

a + b + c = x
a = x * 20/100 = x/5 in prima zi
(x - x/5) * 30/100 = 4x/5 *3/10 = 12x/50 = 6x/25 in a doua zi
x - (x/5 + 6x/25) = 560
25x - 5x - 6x = 14 000
14x = 14 000
x = 14 000 : 14
x = 1 000 km