Equations using 2, 0, 1, 4

How far can you go?
Here are some possible answers:

HOW MANY TRUCKS?

Chemicals are to be shipped by truck. 

We will call the chemicals: A, B, C, D, E, F

Certain chemicals should NOT be put in the same truck.

Using the restrictions found below,
find the least number of trucks needed to ship the chemicals.

(If you wish, you can even show how you would load each truck.)

So that we can compare answers, use the trucks
(in the order listed) with the following colors:

RED, TEAL, GREEN, YELLOW, SILVER, PINK

If we did not want to MINIMIZE the number of trucks used, 

we could send one chemical in each of the SIX trucks!

Here are the restrictions for the Chemicals:
A should NOT BE WITH B or C or D
B should NOT BE WITH A or C or E
C should NOT BE WITH A or D or B
D should NOT BE WITH A or C
E should NOT BE WITH F or B
F should NOT BE WITH E

A MAN HAS A MONKEY.

AT PRESENT, THE MAN’S AGE PLUS THE MONKEY’S AGE TOTALS 100. THE MAN IS NOW THREE TIMES AS OLD AS THE MONKEY WAS WHEN THE MAN WAS 10 YEARS OLDER THAN THE MONKEY IS NOW. HOW OLD IS THE MAn?