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1964 AMC 12 Question 11

AMC12 · 1964 AMC 12

Question 11

Given $2^x=8^{y+1}$ and $9^y=3^{x-9},$ find the value of $x+y.$
  1. $18$
  2. $21$
  3. $24$
  4. $27$
  5. $30$