HKIMO 2020 Grade 6 National Final (Heat) Set 01 Question 23

Numbers are drawn at random from the 108 integers 34 through 141. At least how many must be drawn to ensure two have sum 121?

Source glossary (English–Vietnamese): Draw: chọn; At least: ít nhất; Random: ngẫu nhiên; Ensure: chắc chắn; Sum: tổng.