Question

Tìm x biết x + 20%x = 120

Answer 1

x + 20%x =120

x*1 +20%x =120

x*(1+20%) =120

x*1,2 =120

x       =120/1,2

x      = 100

Answer 2

\(x+20\%x=120\)

\(\Rightarrow x+\frac{1}{5}x=120\)

\(\Rightarrow x.\left(1+\frac{1}{5}\right)=120\)

\(\Rightarrow x.\frac{6}{5}=120\)

\(\Rightarrow x=120:\frac{6}{5}\)

\(\Rightarrow x=100\)