Question

Problema 10.Am rezolvat ceva din ea ,dar du stiu rezolvarea complete.Plzzzzzzzzz help me.

Answer 1

x- banii lui Andrei

- prima xi  avem ; x/4

- a doua zi avem : 1/3*(x-x/4)

- a treia zi avem : 36 lei

a) x = ?

b)Ce suma a cheltiut a doua zi

Rezolvare :

a) x=x/4+1/3*(x-x/4)+36

x=x/4+1/3*3x/4+36

x=x/4+3x/12+36

x=(3x+3x+432)/12

12x=6x+432

6x=432, x=432/6, x=72 lei

b) 1/3*(x-x/4) = 1/3*3x/4 = 3x/12 =x/4 =72/4 =18 lei