Question 22
There are 18 outwardly identical balls. Nine of them have equal mass and are all heavier than the tenth ball. Using a two-pan balance, what is the least number of weighings needed to identify that lightest ball?
Original printed choices: A) 1; B) 2; C) 3; D) 4; E) 5
Editorial task: Explain what information is missing or inconsistent, then derive the source’s intended answer under clearly stated additional assumptions.
Original printed choices: A) 1; B) 2; C) 3; D) 4; E) 5
Editorial task: Explain what information is missing or inconsistent, then derive the source’s intended answer under clearly stated additional assumptions.