Suppose
At the same time, we can write
Note that 
(just reverse the sum). Let's pair the first terms of 
and 
, and the second, and the third, and so on:
Now, each grouped term in the sum on the right side adds to 151. There are 52 grouped terms on that same side (because there are 50 numbers in the range of integers 51-100, plus 50 and 101), which menas
But , as we pointed out, so
80.75 / 8.50 = 9.5
Sean worked 9 and a half hours.
Answer:
a shs s s s ss bsbsbsbs s s s s s s s s s s s s s
9/10/5 9/10*1/5=9/50 miles
<span>Rounded to the nearest 10,000, 45,122 is 50,000. This is because the 5 has been reached and so it is rounded up.</span>
