Question

În automobil a parcurs o distanta de 3 zile 1 zi 25%din drum 2 zi 30%din rest si 3 zi restul de 63 kilometri !Aflati lungimea întregi distante.

Answer 1

I=25/100 x⇒I=1/4x
II=30/100(x-1/4x)⇒II=3/10·(4x-x/4)⇒II=3/10·3/4x⇒II=9/40x
III=63km
..............................................................
lungime drum=120km
..................................................................
I+II+III=1/4x+9/40x+63=x
ADUC LA ACELASI NUMITOR CU 40 SI ELIMIN NUMITORUL⇒
10x+9x+2520=40x
40x-19x=2520
21x=2520⇒
x=120km

Answer 2

25x/100 -I zi
100/100-25/100=75/100 km rest1
30/100-II zi
70/100 rest 2
63- III zi
63km=70/100
63*100/70=90 km
90 km=75%
x=90*100/75=120 km lungimea drumului