Goi tu cua pso do la a,ta co:
\(\frac{a}{7}\)=\(\frac{a+16}{7\cdot5}=\frac{a+16}{35}\)
\(\Rightarrow\frac{a}{7}=\frac{a+16}{35}\)
\(\Rightarrow\frac{a\cdot5}{35}=\frac{a+16}{35}\)
\(\Rightarrow\)\(a\cdot5=a+16\)
\(\Rightarrow a\cdot5-a=16\)
\(\Rightarrow a\cdot4=16\)
\(\Rightarrow a=4\)
Vay pso do la \(\frac{4}{7}\)
Gọi phân số đó là \(\frac{a}{7}\)
\(\frac{a+16}{7\cdot5}=\frac{a}{7}\)
\(\frac{a+16}{35}=\frac{5a}{7\cdot5}\)
\(\frac{a+16}{35}=\frac{5a}{35}\)
\(\Rightarrow a+16=5a\)
\(4a=16\)
\(\Leftrightarrow a=4\)