If Activity A has an early start of 10, an early finish of 16, and a late start of 12, what is the activity's total float?

Total float is the amount of time you can delay the earliest start of an activity without affecting the scheduled deadline. To calculate total float:
Step 1: Draw a network diagram then perform a forward and backward pass.
Step 2: Subtract either the early start from the late start or the early finish from the late finish (both should give you the same answer).