\(\frac{x+3}{20}=\frac{25}{20}\)
\(\frac{x+3}{20}-\frac{25}{20}=0\)
\(\frac{x+3-25}{20}=0\)
\(\frac{x-22}{20}=0\)
\(x-22=0\Rightarrow x=22\)
Để \(\frac{x+3}{20}=\frac{5}{4}\)=>(x+3).4=5.20
=>(x+3).4=100
=>x+3 =100:4
=>x+3 =25
=>x =25-3
=>x =22
Vậy số cần tìm là 22
x + 3 = 5/4 * 20
x + 3 = 25
x = 25 - 3
x = 22
x + 3 = 5/4 * 20
x + 3 = 25
x = 25 - 3
x = 22