30
26 and 27
26 and 27
140 This is because you take the first two numbers (in this case, they are 100 and 30) and these are the first two figures. You then round the 30 to a 40, because of the 8. This then gives you 140.
7.5
28 and 29
30
26 and 27
28 and 34.
26 and 27
26 and 27
29.999999, 29.999998
30
26 and 27
26 and 27
0
30 and 42