math challenge

Weeks of June 1 - 14, 1998

Perfect Piano Performance

World-renowed, concert pianist, Abner, had a custom-made piano with 26 keys. 16 of the keys were white, while 10 keys were black.

At a recent concert, Abner performed a piece in which each note was played separately and in ascending order for an equal length of time (0.5 seconds). There were 1300 notes in the piece.

How many white keys were played? How many black keys were played? How long did Abner spend playing the white keys?

See the solutions