Question

Cineva a avut o suma de bani pe care a cheltuit-o astfel: in prima zi o patrime din total, a doua zi doua cincimi din total si a treia zi o sasime din total ramanandu-i 77 de lei . Cati bani a avut ?

Answer 1

x-x/4-2x/5-x/6=77
num comun 60
(60x-15x-30x-24x -10x)/60=77
11x/60=77
11x=77*60
x=77*60/11=7*60=420

Answer 2

x=suma totala
prima zi: 1/4*x
a 2 a zi: 2/5*x
a 3a :1/6*x
x-(1/4*x+2/5*x+1/6*x)=77
x-(30x/120+48x/120+20x/120)=77
x-(98x/120)=77
120x-98x=77*120
22x=9240
x=420 lei