Answer:
x = mass of the table
chair mass = 3x/7
mass of chair +Tom = 2/3 mass of the table
⇒Tom+3x/7 = 2x/3
⇒Tom = 2x/3-3x/7
⇒Tom = (14x-9x)/21 = 5x/21
⇒the mass of Tom represents 5/21 of the mass of the table
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