A bag contains 20 marbles. 5 are blue and the rest are red. What is the probability of randomly choosing a red marble?

A bag contains 20 marbles. 5 are blue and the rest are red.

=> The number of red marbles in the bag: 20 - 5 = 15

=> The probability of randomly choosing a red marble: P = 15/20 = 0.75

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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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answer: they are supplementary angles

step-by-step explanation: 161+19=180. supplementary angles equal 180 degrees