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Given line graph data are extract in tabular form.

 Total number of students in all five institutes : 3100

 Then average of all student in all five institutes : 3100 / 5

 ⇒ 3100 / 5

 ⇒ 620

 Hence 620 is the correct answer.

Given |:

Total number of boy who enrolled in A,B and C institutes are 

  ⇒ 300+350+270 = 920

Total number of Students ( boy + girl ) who enrolled in C and D institutes are 

 ⇒ 600+800 = 1400

Then Required difference is 

 ⇒ 1400 - 920 = 480

 Hence 480 is the correct answer.

Given |:

 Total number of student ( boy + girl ) enrolled in A,C and E institutes together   are

 ⇒ 500+600+700 = 1800

 Total number of girl enrolled in A,B and E institutes together are

 ⇒ 200+150+300 = 650

 Then required ratio are 1800 : 650

  ⇒ 36 :13

 Hence 36:13 is the correct answer.

Given |:

 Total number of boy who enrolled in institute A are 300

 50% of boys get scholarship 

 ⇒ 300× 50/100

 ⇒ 150

 Number of boy who are not get scholarship 

 ⇒ 300 - 150 = 150

 Total number of girl who enrolled in Institute A are 200

 40% of girls get scholarship 

 ⇒ 200× 40/100

 ⇒ 80

 Number of girls who are not get scholarship 

 ⇒ 200 - 80

 ⇒ 120

 Number of boys and girls in institute A who did not get scholarship 

  ⇒ 150+120 = 270

 Then, required percentage 

 ⇒ (270 /500) × 100

 ⇒  54% 

 Hence 54% is the correct answer.

Given |:

 Number of Boys enrolled in instituted D is 340

 Number of boys enrolled in institute F is 10% more than number of boys who   enrolled in institute D

Then number of boys enrolled in institute F are 

 ⇒ (340 / 100 ) × 110

 ⇒ 374

 Number of Girls enrolled in institute F is 50% more than the number of girls   enrolled in institute E 

 Then number of girls enrolled in institute F are 

 ⇒ (300 / 100) × 150

 ⇒ 450

 Then total number of students ( boy+ girl ) in institute F are 

 ⇒ 450+374

 ⇒ 824

 Hence 824 is the correct answer.

Series follow the following pattern 

 25,31,34,37,43,?

 ⇒ 25 , 31 , 34, 37, 43, ?

        6      3      3    6           ( difference between them )

  ⇒ 6 × 0.5 = 3

  ⇒ 3  × 1 = 3

   ⇒ 3 × 2 = 6

   ⇒ 6 × 4 = 24

Then next term is 43+24 = 67

 Hence 67 is the correct answer.

Series follow the following pattern

 1000, ? , 500, 1000, 250, 2000

 ⇒ 1000 × 0.5 = 500

 ⇒ 500 ÷ 1 = 500

 ⇒ 500 × 2 = 1000

 ⇒ 1000 ÷ 4 = 250

 ⇒ 250 × 8 = 2000

 Then next term is 

 ⇒ 1000 × 0.5 = 500

 Hence 500 is the correct answer.

Series follow the following pattern

 9, 10, 22, 69, 280, ?

 ⇒ 9×1+1 = 10

 ⇒ 10×2+ 2 = 22

 ⇒ 22×3+3 = 69

 ⇒ 69×4+4 = 280

 Then next term is 

 ⇒ 280× 5 +5 = 1405

 Hence 1405 is the correct answer.

Series follow the following pattern

 2, ? , 197, 287, 368, 437

 ⇒ 2, ? , 197, 287, 368, 437

                  90     81     69

                       9        12

 It means there is double difference gap of 3

 Then previous difference is 6

 ⇒ 90+6 = 96

 ⇒ 197 -96 = 101

 next term is 101

 Hence 101 is the correct answer.

Series follow the following pattern 

 80, 87, 61, 124, 0, ?

 ⇒ 80, 87, 61, 124, 0 , ?

        +7   -26  +63 -124

 ⇒ 2³ -1 = 7

 ⇒ 3³ - 1 = 26

 ⇒ 4³ - 1 = 63

 ⇒ 5³ - 1 = 124

 ⇒ 6³ - 1 = 215

 Then next term is 0 +215 = 215

 Hence 215 is the correct answer.