This is semantic memory.
Semantic memory actually refers to your 'general knowledge' - the information that you know about the world in general. The grandfather's semantic memory is quite strong and it doesn't seem to decline, which is why he is still so good at solving crossword puzzles. This refers to knowledge and memory that we accumulate throughout our lives.
Answer is in the photo. I can't attach it here, but I uploaded it to a file hosting. link below! Good Luck!
tinyurl.com/wpazsebu
Interchangeable parts were identical and could be exchanged for one another in manufacturing of goods
Statistical deviation
Deviation from social norms
One foot is equal to 12 inches, so 12 times 12 will give you the number of inches in 12 feet.
12 x 12 = 144
If there are 12 inches in a whole foot, then there are half that many in a half foot, so there are 6 inches in a half foot. Now you have to had 144 inches to 6 inches.
144 + 6 = 150
There are 150 inches in 12 1/2 feet.
Hope this helps!
