Question

Tìm x biết : 

75% * x + 3/4 * x + x = 30

Answer 1

 \(75\%\times x+\frac{3}{4}\times x+x=30\)

\(\frac{3}{4}\times x+\frac{3}{4}\times x+x\times1=30\)

\(\left(\frac{3}{4}+\frac{3}{4}+1\right)\times x=30\)

\(\frac{5}{2}\times x=30\)

\(x=30\div\frac{5}{2}\)

\(x=\frac{30\times2}{5}\)

\(x=\frac{60}{5}=12\)

Vậy x = 12