Question

In a class of 60 students,the number of students who passed biology is 6 more than the number who passed chemistry.Every student passed at least one of the two subjects.i.how many students passed biology ii.how many students passed chemistry iii.how many students passed only one subject

Answer 1

If x take both,
b+c-x = 60
b = c+6

2c+6-x = 60
2c-x = 54

So, unless you know something more, there are many possible solutions, such as

x=0, b=33, c=27
x=2, b=34, c=28
...
x=52, b=59, c=53
x=54, b=60, c=54

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