Question

solve for n. n/n+15=4/9​

Answer 1

Answer:

n=12

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Answer 2

Heya !

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$\frac{n}{n \: + \: 15} \: = \: \frac{4}{9} \\ \\ by \: cross \: multipliction \\ \\ = > \: n \: ( \: 9 \: ) \: = \: ( \: n \: + \: 15 \: )( \: 4 \: ) \\ \\ = > \: 9n \: = \: 4n \: + \: 60 \\ \\ = > \: 9n \: - \: 4n \: = \: 60 \\ \\ = > \: 5n \: = \: 60 \\ \\ = > \: n \: = \: \frac{60}{5} \\ \\ = > \: n \: = \: 12 \: \: \: \: \: \: \: \: \: \: ans$

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Thanks !!