Lillian sees a chair at the Exploratorium that has been scaled up by three. In attempting to lift it, she finds the chair is
A)three times as heavy.
B)six times as heavy.
C)nine times as heavy.
D)more than nine times as heavy.

Question

Quizplus · Accepted Answer

When an object is scaled up uniformly by a factor of three, its volume (and thus its weight, assuming constant density) increases by a factor of $3^3 = 27$. Therefore, the chair would be more than nine times as heavy.

Lillian Sees a Chair at the Exploratorium That Has Been