There are 100 black keys in a pipe organ with 240 keys
The ratio of black and white keys in a pipe organ is given as:
\(Black :White = 5 : 7\)
So, the proportion of black keys in a pipe organ is:
\(Black = \frac{5}{5 + 7}\)
Evaluate the denominator
\(Black = \frac{5}{12}\)
When there are 240 keys, the total number of black keys is:
\(Black = \frac{5}{12} * 240\)
Multiply
\(Black = \frac{1200}{12}\)
Divide 1200 by 12
\(Black = 100\)
Hence, there are 100 black keys in a pipe organ with 240 keys
Read more about ratios and proportions at:
https://brainly.com/question/1781657
