Question

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

Answer 1

Answer:

35 Step-by-step explanation: Here we see 5 black keys for every 7 white keys. So the ratio is 5:7

If we need 49 white keys, find the amount we scale the original ratio by:

49/7 = 7

So we are scaling by a factor of 7.

The number of black keys would be 5 the scale of

7. = 35

So there should be 35 black