If 1/5 of a distance is 4 miles, how far is 3/5?

its 50 miles away from the starting point

hello,

as   long as they add up to 180 its correct.

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in counting the number of heads in 4 coin flips, the probability that we get exactly one head is the probability that we get anyone of the following 4 outcomes: httt, thtt, ttht, or ttth. each has probability 1/16, so the probability to get exactly one head in 4 flips is 1/16 + 1/16 + 1/16 + 1/16 = 4/16 = 1/4.