10/40 simplified is 1/4
1/4 equals 25%
"Like sparks from a blacksmith's window" refers to the sparks that happen when a blacksmith is working. The meaning depends on the context. The context should usually be something like anger, exploding anger, or it could be excitement...
"A Good Man is Hard To Find" is a short story written by Flannery O'Connor in 1953. The story focuses on a family car trip with the Bailey family. The Grandmother continuously attempts to reroute the trip. Through many stops and hurtles the characters highlight a discussion of subjective values leading to the declaration "a good man is hard to find."