Question

PLEASEEE SOMONEE HELP ASAP!!

If the pattern shown continues how many black keys appear on a keyboard with 35 white keys ?

Answer 1

25 black keys

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 =
`(35*5)/(7)`

x = 5 *5

x = 25