Question

In an examination there are three subject a b and ca sab a student has to pass in each subject 20%student failed in A,22% Total number of students passing the whole examination lies between?
(A) 42%and 84%
(B) 42% and 78%
(C) 58% and 78%
(D) 58 and 84%​

Answer 1

Answer:

A) 42% and 84%

Step-by-step explanation:

(a) Pass % is minimum when failure % is maximum.

Maximum % of failure = 20 + 22 + 16 = 58%

∴ Minimum pass % = 100 – 58 = 42%

Now, pass % is maximum, when failure % is minimum.

Minimum % of failure = 16%

(∵ 22 % failure covers both 16% and 20% i.e, 22% is the minimum value of failure %).

∴ Maximum % of passing = 100 – 16 = 84%

Hence, pass % range = 42% to 84%.

Answer 2

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Pass % is minimum when failure % is maximum. Maximum % of failure = 20 + 22 + 16 = 58 %

∴ Minimum pass % = 100 – 58 = 42 %

Now, pass % is maximum, when failure % is minimum.

Minimum % of failure = 16 %

(∵ 22 % failure covers both 16 % and 20 % i.e, 22% is the minimum value of failure %).

∴ Maximum % of passing = 100 – 16 = 84 % Hence, pass % range = 42 % to 84 % .

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