The royal opera house orchestra in london, england, includes 13 musicians who play the viola. the musicians in the viola section make up 12 1/2 % of the orchestra .how many musicians are in the royal opera house orchestra?

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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