The price of a washing machine is 2/(2+3)=2/5 of the total money.
Then the total money for color TV and stereo: (1-2/5)=3/5.
Audio accounts for 1/4 of the total price of color TV and audio.
Audio accounts for (3/5)x( 1/4)= 3/20 of the total price.
There are more washing machines than stereos;
2/5-3/20= 1/20
It is known that stereos are cheaper than washing machines, 720 yuan,
Washing machine, color TV and stereo * * *:
720/( 1/20)= 14400 (yuan)