Helengg Helengg

31-03-2015
Mathematics

Answered

A piano has 88 keys. The ratio of white keys to black keys is 13.9. How many black keys does a piano have?

Answer :

0000000 0000000

31-03-2015

black keys=b
white keys=w
b+w=88|·9
w:b=13/9⇒9w=13b
9b+9w=792
13b+9b=792
22b=792|:22
b=36 keys
w=88-36
w=52 keys

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loreleiloves20p5m1ob loreleiloves20p5m1ob

26-02-2019

Answer:

36

Step-by-step explanation:

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