Agardener has a container with 6 1/5 ounces of liquid plant fertilizer on sunday the gardener uses 2 1/2 ounces on a flower garden how many ounces of liquid plant fertilizer are left ?

Amount of liquid plant fertilizer in the container that the gardener has = 6 1/5 pounds
                                                                                                               = 31/5 pounds
We already know that 1 pound = 16 ounce
Then
Amount of liquid plant fertilizer in the
container that the gardener has = (31/5) * 16 ounce
                                                    = 496/5 pounds                                                          
Amount of liquid plant fertilizer that the gardener uses on Sunday = 2 1/2 ounces
                                                                                                         = 5/2 ounces
Then
The amount of liquid plant fertilizer that are left= (496/5) - (5/2) ounces
                                                                           = (992 - 25)/10 ounces
                                                                           = 967/10 ounces
                                                                           = 96.7 ounces
So the total amount of liquid plant fertilizer left is 96.7 ounces.

The answer is "It depends"

Step-by-step explanation:

All the possible options have different amount of digits after of the decimal point. If we have to decide the most precise measure, it will depend mostly on the way of using that value.

For example, if we are using a compass, we do not need a measure with decimal digits because it will be harder to draw with that instrument.

If we are using a 3D printer, it will be more precise to use a measure with decimal digits because the machine will be able to use that value to build something.

Finally, the answer will depend on the using of the value.