Question

Daca la dublul unui numar se aduna 4 1pe5 se obtine 25. Afla nr.

Answer 1

2·x+4·$\frac{1}{5}$=25
2·x+$\frac{4x5+1}{5}$=25
2·x+$\frac{21}{5}$=25
5·2·x+21=5·25
10·x+21=125
10·x=125-21
10·x=104
x=104÷10
x=10,4