Question

college 70 of the students studied maths , 75 %, studied engilsh 85% studied French and 80% studied greman . what percentage at least must have studied all 4​

Answer 1

Correct question -

In a college 70% of students study maths 75% studied English 85% studied French and 80% studied German what is the percentage at least must have studied all four subjects.

Solution -

The students studies each subject in different percentage.

Maths - 70%

English - 75%

French - 80%

German - 85%

Let's find out the percentage of student that do not that specific subject

Students not studying maths are 30%

Students not studying English are 25%

Students not studying French at 20%

Students not studying German are 15%.

Now total percentage of student which do not study any specific subject among of these four -

30+ 25+ 20 + 15 = 90% .

So by subtracting this percentage from the total percentage of student we can get the percentage of students studying all the four subjects.

→ 100- 90 = 10% .

So 10% student is answer.