Three people each took 5 tests. If the ranges of their scores in the 5 practice tests were 20, 28 and 35, what is the minimum possible range in scores of the three test-takers?  Choose one.
A) 30  B) 35  C) 25  D) 15  E) 28
I simply looked at the 3 different possible scores for each individual test: 20,35,28   We have to find the minimum range:    35-20= 
<gadget id="calculator"> 35-20</gadget>
<output>15</output>
15   35-28= 
<gadget id="calculator">35-28</gadget>
<output>7</output>
7   28-20= 
<gadget id="calculator">28-20</gadget>
<output>8</output>
8   The find the minimum range, you have to make the set of the 5 scores as small as possible.   Which means that 4 of the 5 scores of each individual person is zero.   7*5= 
<gadget id="calculator">7*5</gadget>
<output>35</output>
35   Answer:35
<result>B</result>
Three people each took 5 tests. If the ranges of their scores in the 5 practice tests were 20, 28 and 35, what is the minimum possible range in scores of the three test-takers?