Question

Determinati numarul x,astfel incat media aritmetica a numerelor 21;14,4;34,6 si x sa fie 29.Please urgent.​

Answer 1

$\frac{21+14,4+34,6+x}{4}=29|*4<=>21+x+ 49=116<=>70+x=116<=>x=116-70=>x=46$