In a certain alphabet, 20 letters contain a dot and a straight line. 36 letters contain a straight line but do not contain a dot. If that alphabet has 60 letters, all of which contain either a dot or a straight line or both, how many letters contain a dot but do not contain a straight line? Select the correct option.
A) 4 B) 3 C) 14 D) 20 E) 28
We are told that all of the letters contain either a dot or a straight line or both, which implies that there are no letters without a dot and a line (no line/no dot box = 0).   First we find the total # of letters with lines:  20 +36= 
<gadget id="calculator"> 20 +36</gadget>
<output>56</output>
56;   Next, we find the total # of letters without line:  60 - 56= 
<gadget id="calculator"> 60 - 56</gadget>
<output>4</output>
4;   Finally, we find the # of letters that contain a dot but do not contain a straight line: 4 - 0= 
<gadget id="calculator">4 - 0</gadget>
<output>4</output>
4.
<result>A</result>
In a certain alphabet, 20 letters contain a dot and a straight line. 36 letters contain a straight line but do not contain a dot. If that alphabet has 60 letters, all of which contain either a dot or a straight line or both, how many letters contain a dot but do not contain a straight line?