Question

In a class of 50 students, each one come to school by bus or by bicycle or on foot. 25 by bus, 20 by bicycle, 30 on foot and 10 students by all the three. Now how many students come to school exactly by two modes of transport?

Answer 1

Hi mate ....
Here is your answer ..
20+10
=30 students came by two modes of transport .
Hope it helps you ...
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Answer 2

Total number of students = 50

Students come to school by bus = 25

Students come to school by bicycle = 20

Students come to school by foot = 30

Students come to school by all the three = 10.

Now we show the whole data in the Venn diagram. We have t find out how many students use to come to school exactly by two modes of transport. For this problem, we have to count all the types of transport. So from the Venn diagram, we have

n(use exactly two types of transport) = [n(bus and bicycle) + n(foot and bicycle) + n(foot and bus)]

                                                             = [30 + 25 + 20 - 3*10 +10 -50]

                                                             = 5(ans.)