The graph shows the mass, in kilograms, of Jeff’s pet Atlantic cod, given its age in years.
What is the age of the cod when its mass is 15 kg?
, 2013
Pick one
Solution
A mass of 15 kg is halfway between 10 kg and 20 kg on the vertical axis.
The point where the graph reaches 15 kg is halfway between 6 and 8 on the horizontal axis.
[[IMAGE0]]
Therefore, the cod is 7 years old when its mass is 15 kg.
Want a route through all this instead of an archive? The track
puts 2,444 problems in a working order, from Junior Challenge level to the IMO shortlist.