Question

1. In an online competitive exam, there are 50 questions. Each question fetches three marks if the response is correct and attracts a penalty of one mark if the response is incorrect. Marks are not awarded for unanswered questions. Due to a technical glitch, each correct response was given four marks, each incorrect response was given zero mark and each unanswered question was given one mark. If a student scored 40 marks, find the actual score he should have got
(A) 0 (B) 10 (C) -10 (D) -5

Answer 1

Answer:

c) -10

Step-by-step explanation:

let x - number of questions answered corectly

y - number of unanswered questions

z - number of questions answered wrong

we know that,

x + y + z = 50

correct eqn fr validation is -----> (3 * x) + (-1 * z) + (0 * y)

simplification we will get -----> 3x - z = ? (This is the answer needed to be find)

incorrect eqn fr validation due to glitch ------> (4 * x) + (0 * z) + (1 * y) = 40

4x + y = 40

y = 40 - 4x

substitute y = 40 - 4x in x + y + z = 50

x + 40 - 4x + z = 50

-3x + z = 10

multiply by -1 on both sides:

3x - z = -10 (This is the answer eqn to be found)

Answer 2

Answer:

Hiii

Step-by-step explanation: