The table shows the travelling time to work of 50 people. Frequency
Travelling time
in minutes
0 5
10 < t < 20
15
20 13
30 < t < 40
10
40 7
Calculate an estimate of the mean travelling time.

Jessica is organizing a guided tour of the rain forest. the average profit per person that the touring company makes is given by the rational expression 18x+35/x, where x is the number of people going on the tour. what does the numerator of this rational expression represents?