Asurvey is made in a neighborhood of 80 voters. 65 are democrats and 15 are republicans. of the democrats, 35 are women, while 5 of the republicans are women. if one subject from the group is randomly selected, find the probability the individual is a democrat or a republican.

Answer:  1

Step-by-step explanation:

Given: Total voters n(S)= 80

Number of democrats n(D)= 65

Number of republicans n(R)= 15

Number of voters that are democrats and republicans=

[Since both are different parties and thus independent means no individual can be common in both parties]

Then, the number of individuals that are  democrat or republican is given by :-

If one subject from the group is randomly selected, find the probability the individual is a democrat or a republican=

One way to make this easier is to write the units.

You have $16.80 / 4 gallons.   That's  $4.20 per gallon, or we can write  4.20 dollars/gallon.

Since you want gallons per dollar, just invert the 4.20:

   N gallons / dollar = (1/N) dollars / gallon:  

   1/ (4.20 dollars/gallon) = 0.2381 gallons / dollar.

I hope this makes sense.

(Sanity) Check:  0.2381 gallons for $1   … That's a little less than one quarter gallon for $1, so if I wanted an entire gallon it would be a little over $4.  Looks reasonable.