A green lizard can travel from the green cave to the blue cave in 108 minutes; the blue lizard can travel from the blue cave to the green cave in 25% less time. If the green lizard started to travel 7.5 minutes before the blue lizard, how many minutes after the blue lizard, will the green lizard pass the middle line? 

In a marketing study, consumers were given two unlabeled cartons of laundry detergent. One carton was bright green and yellow; the other was drab brown and gray. After using the detergent in the two cartons for one month, 83 percent of the consumers in the study reported that the detergent in the bright green and yellow carton cleaned better. This study shows that packaging has a significant impact on consumers’ judgment of the effectiveness of a laundry detergent. Which of the following, if true, would most strengthen the conclusion drawn in the marketing study?

A, B and C are consecutive integers. If X = (A × B × C) / 2, what can be said about X? 

John is three times as old as Sam. If John will be twice as old as Sam in six years, how old was Sam two years ago?