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The ratio of adults being 5:3 means that you should first divide the audience into 8 sections. You get 18. Now, you can multiply 18 by 5 to find out how many adults there are, since 5 means quantity of adults. 

There are 90 adults

\(90\) adults

A ratio indicates how many times one number contains another.

Total number of people in an audience \(=144\)

Ratio of adults to children is \(5:3\)

Let number of adults be \(5x\) and number of children be \(3x\)

So,

\(5x+3x=144\)

        \(8x=144\)

          \(x=18\)

Number of adults \(=5(18)\)

                              \(=90\)

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