[tex] \red{ \boxed{\bf x = \dfrac{1200}{101} = 11,88}}[/tex]
Explicație pas cu pas:
[tex] \bf x \cdot(1+2+3+...+100)=60 \: 000[/tex]
[tex]\bf x \cdot100 \cdot101 :2 =60 \: 000[/tex]
[tex]\bf x \cdot50 \cdot101 =60 \: 000 \: \: \: \bigg| : 50[/tex]
[tex]\bf x \cdot101 =1200[/tex]
[tex] \red{ \boxed{\bf x = \dfrac{1200}{101} = 11,88}}[/tex]