Since carl has moved away for college, he calls his best friend every fifth day, his parents every third day, and his grandmother every fourth day. carl made all three calls on october 8. in how many days will he make three calls again?

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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step-by-step explanation: