Answer:
x = 53
Explanation:
Assuming that the river is of constant width throughout.
x + (2x + 21) = 180
x + 2x + 21 = 180
3x + 21 = 180
3x = 159
53
they are a linear pair so x + 2x + 21 = 180 so you subtract 21 from both sides, combine x and 2x then divide by 3 to get 53
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