21. Five mark exercise problems IX

1. A survey of \(1000\) farmers found that \(600\) grew paddy, \(350\) grew ragi, \(280\) grew corn, \(120\) grew paddy and ragi, \(100\) grew ragi and corn, \(80\) grew paddy and corn. If each farmer grew atleast any one of the above three, then find the number of farmers who grew all the three.

 

Answer:

 

The number of farmers \(=\)

 

2. 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:

 

The number of students come to school exactly by two modes of transport \(=\)