decimals
posted by sofia .
how is 2.320=17.7 reasonable

It is not reasonable. When you take a number from a smaller number, the difference is negative.
Negative 17.7 is reasonable. 
It is not reasonable because when I added 17.7 and 20 I got 2.3

you do know one of the numbers we subtracted is 2.3

.you do know one of the numbers we subtracted is 2.3