## Solution - Prints

by Nathan Fung, Joanna Cheng, and Hosea Siu

Each image consists of two superimposed sections of MIT blueprints. Each image contains either a + or a - in the superimposed section as well as two notes of the form "Let - = #" where # is some digit each by a different building. For each image, identify the two room numbers where the + or - sign is, insert the digit (in the note by each building) in place of the dash, and then add or subtract.

Besides the last two, the resulting numeric string can be interpreted as a room number using the same mechanism where one of the digits is actually a dash. In particular, each string can be interpreted as a room number of a room on campus that is named after a person. Using the number that the dash replaces as an index into the last name of the room gives the message FATHER OF GPS. The last two blueprints give the single digits 8 and 9. This is an enumeration for the answer. The clue is thus FATHER OF GPS (8 9) cluing BRADFORD PARKINSON.

Room 1op.Room 2ExpressionResultNew RoomIndexRoom NameExtract
50-260 - 41-109 509260-415109 94151 9-151 4 KAUFMAN F
38-444 - 2-016 389444-27016 362428 36-428 2 HAUS A
76-151 + 54-911 762151+549911 1312062 13-2062 1 TANAKA T
66-259 - 56-154 664259-560154 104105 10-105 4 BUSH H
33-407 - 26-069 339407-266069 73338 7-338 3 STELLA E
36-564 - 10-150 368564-102150 266414 26-414 6 KOLKER R
39-412 - 6-206 395412-61206 334206 33-206 4 DU PONT O
9-355 - 8-119 95355-81119 14236 1-236 4 SPOFFORD F
16-551 + 37-372 162551+379372 541923 54-923 1 GREEN G
7-211 - 1-107 79211-15107 64104 6-104 4 CHIPMAN P
34-201 + 4-265 342201+43265 385466 38-466 5 JACKSON S
5-134 - 5-126 50134-50126 8 8
3-152 - 3-143 30152-30143 9 9