What was a quipu used for in the Andes?

Answer and explanation

Correct answer: C. Recording numbers, and perhaps other data, with knots in cords

  1. Step 1: A quipu was a set of cords hanging from a main cord, each tied with knots. Step 2. The type, position and number of knots recorded counts of people, goods and tribute. Answer: Recording data with knots in cords. Why not the others: Smoke signals, sun measurement and weighing are not what quipus did.

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