On a full sized piano their are 36 black keys and 52 white keys express the ratio black keys to whtie keys as a fraction in simplest form explane its meaning

Black keys : white keys

b : w =  36 : 52

b : w =  18 : 26  =  9 : 13

b : w  = 9 : 13

Total ratio =  9 + 13 = 22.

It means for every 9 black keys you have 13 white keys.

It also means for the piano the fraction of black keys is  9/22 of the entire piano

It also means for the piano the fraction of white keys is  13/22 of the entire piano

12 blue marbles

Step-by-step explanation:

I by 5 percent chance of blue marble

Let the number of blue marbles be x

X/60=1/5

5x=60

X=60/5

X=12