x= numarul de elevi din acea scoala
Elevi in clasa 1: 1/4×x
=>x-x×1/4=3/4×x (elevi care nh sunt in clasa 1)
Elevi in clasa 2 : 1/3×x + 10
=>(3/4×x)-(1/3×x+10)
=>9/12×x - 4/12×x - 10
=>5/12x-10 (elevi in clasele 3 si 4)
Elevi in clasa 3: 3/5
=> (5/12×x-10)-(3/5×5/12×x-10)=56
5/12x-10-3/5x×5/12x+10=56
5/12x-3/12x=56
2/12x=56
x=56/1:2/12
x=56/1×12/2
x=28×12
x=336
Raspuns: Sunt in total 336 de elevi (atat se cere)
Sper ca ai inteles.. daca iti place poti sa imi dai coronita
