Question

Tìm y, biết: \(\frac{42+y}{76}=\frac{153}{171}\)

Answer 1

\(\frac{42+y}{72}=\frac{153}{171}\)

\(\Rightarrow\left(42+y\right)\times171=76\times153\)

\(\Rightarrow\left(42+y\right)\times171=11628\)

\(\Rightarrow42+y=11628:171=68\)

\(\Rightarrow y=68-42=26\)

Answer 2

\(\frac{42+y}{76}=\frac{153}{171}\Rightarrow171\left(42+y\right)=153.76\Rightarrow7182+171y=11628\Rightarrow171y=4446\Rightarrow y=26\)

Vậy y = 26

Answer 3

\(\frac{42+y}{76}=\frac{153}{171}\)

\(\left(42+y\right).171=153.76\)

\(\left(42+y\right).171=11628\)

\(42+y=11628:171\)

\(42+y=68\)

\(y=68-42\)

\(y=26\)

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