Four carpenters each built an average of 42 chairs last week. If no chairs were left uncompleted, and if Peter, who built 50 chairs, built the greatest number of chairs ,what is the least number of chairs one of the carpenters could have built, if no carpenter built a fractional number of chairs?

Answer 1

They built a total of 42*4=168 chairs.
Peter built 50 chairs, (the most),
Paul built 49 (most below 50)
Mary built 49 (most below 50)
So
Lent built 150-50-49-49=20 chairs.