Human: Mark can jump 6 inches off the ground. Lisa can jump double the height as Mark, and Jacob can jump double the height of Lisa. If James jumps 2/3 as high Jacob, how high can James jump? Assistant:
Lisa can jump 6*2 =12 inches.
Jacob can jump 12 *2 = 24 inches.
James can jump 24*(2/3)= 16 inches high.