Answer:
A blue house has blue bricksΝΎ a yellow house has a yellow bricks. What is a green house made of?
What instrument can make any sound and be heard but not touched or seen?
What body part is pronounced as one letter but written with three, only two different letters are used?
What can be measured but has no length, width or height?
One more than a duet.
People take me on walks and I run and have fun. What am I?