Problem number eight. The weight restriction notice for an elevator says it can carry either 12 adults or 20 children. According to the weight restriction, what is the largest number of children that can ride in the elevator with nine adults? So first we can notice that with nine adults the elevator is at 9 twelfths or 3 fourths of its weight limit because the elevator can carry at most 12 adults. So this means that the children need to be 1 fourth of the weight of the elevator because that's the only amount of weight left that the elevator can handle. And since the elevator can take 20 children when it's at full weight limit, that means that 1 fourth of 20 children will be 5 children. And so 5 children can fill up the remaining 1 fourth of the weight limit of the elevator. So that means that the largest number of children that can ride in the elevator with nine adults is 1 fourth of 20 or 5 children. So the answer is C, 5.

elevator

weight restriction

adults

children

calculation