Posted by Ignatz on .
A person exercises for a total of 25 minutes.
Of the 25, 20 minutes is at Level 2.
Of the 25, 5 minutes is at Level 3
What is the average level for the 25 minutes?
Provision of a formula for future problems like this will be appriciated.

Math 
PsyDAG,
(20*2 + 5*3)/25 = ?