Question

piano task
pianos and pipe organs contain keyboards, a portion of which is shown below.
a) what is the ratio of black keys to white keys in the picture above?

Explanation:

Step1: Count black keys

From the piano key image, we can see that the number of black keys is 5.

Step2: Count white keys

Looking at the piano key image, the number of white keys is 7.

Step3: Find the ratio

The ratio of black keys to white keys is the number of black keys divided by the number of white keys, so it is $5:7$.

Answer:

The ratio of black keys to white keys is $5:7$.