C. 12. 6 and 4 have 12 in them. 6 multiples: 6, 12, 18, 24, 30, 36, 42, 48, 54, and so on. 4 multiples: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, and so on. Both have the common number 12.
Length = 80 m and breadth = 60 m If one moves along the two adjacent sides, one covers 80+60 = 140 m. Diagonal of the rectangle = √ ( length^2 + breadth^2) ...