Use the definition of conditional probability to find the "and" probability:

Use the inclusion/exclusion principle to find the "or" probability:

Maybe
In a linear equation, the independent variable increases at a constant rate while the dependent variable decreases at a constant rate.
Answer:
Each board is (4/25) meters long = 0.16 meters long
Step-by-step explanation:
The board is 4/5 meters long, and he needs to cut 5 equal pieces, so we need to divide 4/5 of a meter in 5 parts.
This mathematically becomes: 4/5 divided by 5 which by the definition of division of rational numbers, is the same as :
4/5 times the reciprocal of 5 = (4/5) * (1/5) = (4/25) = 0.16 meters each board