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AIMO 2021 Secondary 1 — Preliminary (Open Trial 1) Question 5

AIMO · AIMO 2021 Secondary 1 — Preliminary (Open Trial 1)

Question 5

Anna receives red packets containing 10 dollars, 20 dollars or 50 dollars each. The numbers of 10 dollars and 50 dollars packets are equal, and the total value is 820 dollars. What is the minimum number of packets?

Original printed choices: A: 15; B: 20; C: 25; D: 30.

Editorial response format: give the exact answer; the original choices are retained for reference.