The gateway arch in st. louis, missouri, weighs about 20,000 tons. write an amount that could be the exact number of tons the arch weighs

We can choose any numbers that would round up or round down to 20000

Any numbers between 19500 and 19999 would round up to 20000
Any numbers between 20001 and 24999 would round down to 2000

For example, the number 19659 would round up to 20000, or the number 21564 would round down to 20000.