3. What is the total amount 1 of "problems of work"?
THAT IS,
the standard unit size of that problem is the total amount of work of that problem.
If you only heard a word "work",
it does not make sense concretely, I afraid.
But the total amount of work means only our duty's size
(that is, reading a whole book,
or 1500 pages papers of office works (oh!),
or 1500 m2 of picking weeds (oh!), or anything else).
So, duties will change by settings of problems,
and the number of needed days and needed people will also change.
If there is no words about duty's subject in sentences of your given problem,
you can imagine it as you like.
We usually fix the total amount of duty as (in a left circle, "1 (one)" is there, not "I").
So an amount of work in a day of a person who ends it in 12 days
is written as
(If you want to know about a standard unit size,
please read 1. What is 1 as ratio? in advance.)
If you want to understand it to fit our feelings more,
I recommend you to think a subject of works (our duties)
as a work that we eat one cake of tofu (or pudding).
If someone can end a work of your given problem in 12 days,
his eating amount in a day is one 12th of a cake.
In Japan, a size of a cake of tofu is usually fixed.
So, I propose another example of things which have various size of a cake
as pudding.
There are cup size, bowl size, and bucket size of pudding.
But we can treat all as .
And more,
when we count the cumulative total number of people,
we count repeating same person as different persons by his repeating times.
2017.09.29 (GMT)
I inserted an enter under "THAT IS,..." sentence.
(in a left circle, "1 (one)" is there, not "I").
