\(\frac{42+y}{76}=\frac{153}{171}\)
\(\left(42+y\right):76=\frac{153}{171}\)
\(42+y=\frac{153}{171}\text{×}76\)
\(42+y=68\)
\(\Rightarrow y=68-42\)
\(\Rightarrow y=26\)
\(\frac{42+y}{76}=\frac{153}{171}\)
\(\left(42+y\right):76=\frac{153}{171}\)
\(42+y=\frac{153}{171}\text{×}76\)
\(42+y=68\)
\(\Rightarrow y=68-42\)
\(\Rightarrow y=26\)