3 years ago

PLEASEEE SOMONEE HELP ASAP!!

Mathematics

1 answer:

Archy [21]3 years ago

6 0

Answer:

25 black keys

Step-by-step explanation:

Let the number of requires black keys = 'x'

White key : Black keys = 7 : 5

7 : 5 :: 35 : x

Product of extremes = product of means

7 *x = 35 * 5

x = $\frac{35*5}{7}$

x = 5 *5

x = 25

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