The gold coin given to two generations on August 1st is 450/5=90.

Before the second exchange

Two generations of love gold coins (150-90)*2= 120.

Before the second exchange

The gold coin given to Bayi by two generations is 120/2=60.

The second exchange is over.

Gold coins of Bayi

450-90+60=420

The first communication is over.

The difference between the last two gold coins is 450- 120=330. Divide Bayi's money into five points, three of which are the difference after the first exchange, so that we get the original gold coins of Bayi.

330/3*5=550

To get the original number of Bayi gold coins, we have to use equations to explain it here, but in fact we can't explain the meaning of specific representatives.

a*4/5+b/2=450

b/2+a/5= 120

The original quantity of love gold coins of two generations, (120-550/5)*2=20.

Finally, 150-20= 130 got the result.