Mathematics
Mathematics, 07.11.2020 08:00, dilly1190

Pianos and organs have keyboards, a portion of which is shown below. How many black keys will appear on a portable keyboard with 35 white keys? How many black keys will appear on a pipe organ with a total of 240 keys?

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Pianos and organs have keyboards, a portion of which is shown below. How many black keys will appear...

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