Tricks to Solve Caselet DI For SBI PO Mains

Caselet seems like a word problem but it is actually data interpretation. In a simple language we may call it an English comprehension. When we deduce the caslete problems, it becomes tabular DI or Venn diagram DI or both. It is easy to solve if you follow the below steps. 

Step-1 Read the given paragraph thoroughly.
Step-2 Then try to note down each and every data.
Step-3 Then deduce these data in a graphical form like tabular, Venn diagram or both.
Step-4 Now you can easily answer the questions asked.

To make it clear, I am solving a caselet problem asked in SBI PO mains.

In a medical college there are 1600 students studying Dentistry and Homeopathy. Each student from each course knows one or more languages out of English, Hindi and Bengali. 45% of the students study Dentistry and the remaining students study Homeopathy. Out of the students studying Dentistry, boys and girls are in the ratio 5:3. Out of the boys studying Dentistry, 16% know only English, 10% know only Hindi and 4% know only Bengali. 24% know English as well as Hindi, 20% know English as well as Bengali and 14% know Hindi as well as Bengali. The remaining boys know all the three languages.
Out of the girls studying Dentistry, 20% know only English, 10% know only Hindi and 10% know only Bengali. 20% know English as well as Hindi, 20% know English as well as Bengali and 10% know Hindi as well as Bengali. The remaining girls know all the three languages.
Out of the students studying Homeopathy, boys and girls are in the ratio 4:7. Out of the boys studying Homeopathy, 20% know only English, 15% know only Hindi and 5% know only Bengali. 15% know English as well as Hindi, 25% know English as well as Bengali and 10% know Hindi as well as Bengali. The remaining boys know all the three languages.
Out of the girls studying Homeopathy, 15% know only English, 15% know only Hindi and 5% know only Bengali. 20% know English as well as Hindi, 20% know English as well as Bengali and 15% know Hindi as well as Bengali. The remaining girls know all the three languages.

Questions: 

1) How many students studying Dentistry know only either English or Hindi?
2) How many students in the college know all the three languages?
3) What percent of the total number of girls in the college know Bengali?
4) How many students studying Homeopathy do not know English?
5) Out of the students studying Homeopathy, what is the ratio of the number of boys knowing English to the number of girls knowing Hindi?

Solution:

Total number of students=1600.
Number of students in Dentistry= 45% of 1600= 720.
Number of students in Homeopathy= 1600-720=880.
Ratio of boys and girls studying Dentistry= 5:3.
Number of boys studying Dentistry= (5/8) * 720= 450.
Number of girls studying Dentistry= (3/8) * 720= 270.
Ratio of boys and girls studying Homeopathy= 4:7.
Number of boys studying Homeopathy= (4/11) * 880= 320.
Number of girls studying Homeopathy= (7/11) * 880= 560.
Now make a diagram to put these values.


1) 16% of 450 + 10% of 450= 117.
20% of 270 + 10% of 270= 81.
On adding these two, we get 198.
Note: In case of either or, we use addition concept.

2) 12% of 450 + 10% (320+560+270) =169.

3) [(50% of 270 + 50% of 560) /(270 +560)] *100=50%.

4) 30% of 320 + 35% of 560= 292.

5) (70% of 320)/(60% of 560)= 2:3.