A weaving unit's supervisor claims that most of the looms which stand idle for more than a week are idle for want of a spare part. Which of the following, if true, would show the supervisor's claim to be false?

The claim is about most of a group, so only a count over the whole group can defeat it, and nine out of forty is well short of most. A single loom idle eleven days for want of an operator is entirely compatible with the claim, since 'most' allows exceptions. The two looms idle three days fall outside the group the claim speaks of, and the size of the unit's stock of looms bears on nothing.