a=108*195/135=156
y=156/195=4/5
y=4/5
a = (108 x 195 ) : 135 = 156
...check mk nha
\(\frac{108}{135}=\frac{a}{195}\Rightarrow108.195=135.a\)
=>21060=135.a
=>a=21060:135
=>a=156
\(\Rightarrow108.195=135.a\)
\(\Rightarrow21060=135.a\)
\(\Rightarrow a=21060:135\)
\(\Rightarrow a=156\)