The water capacity of the large and small ponds is x tons, and the capacity of the y-ton ponds is one ton, 1.6a tons respectively.

-& gt； x-( 1.6a-y)= 5-& gt； x+y= 1.6a+5

y-(a-x)= 36-& gt； x+y=36+a

-& gt； a= 155/3

-& gt； x+y=263/3

That is, there are 263/3 tons of water in the two pools.

I hope I can help you.