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IMAS 2016 — Junior — Round 1 Question 1

IMAS · IMAS 2016 — Junior — Round 1

Question 1

What is the value of $\sqrt{(-20)^2}+16^2-15^2$?
  1. $-19$
  2. $11$
  3. $21$
  4. $51$
  5. $61$