Question

In a class test +2 marks are given for every correct answer and -1 mark is given for
every incorrect answer and 0 for not attempting any question.
() Shruti scored 26 marks. If she has got 14 correct answers, how many questions
has she attempted incorrectly?
(a) Rekha scores - 6 marks in this test, though she has got 8 correct answers. How
many questions has she attempted incorrectly?
A certain freezing process requires that room temperature be lowered from 40°C at
the rate of 5°C every hour. What will be the room temperature 10 hours after the
process begins?​

Answer 1

Answer:

() Shruti scored marks = 26.

Correct answers are 14

Marks for correct answer = 14×2 = 28.

Now, 28-26 = 2

2 are wrong answers.

She attempted 2 que incorrectly.

(a) Rekha scored marks = -6

Correct ans = 8

Marks for correct ans = 8×2 = 16.

-6 -16 = -22

That means she attempted 22 que incorrectly.

After the process begins the temperature will be -10°C.

Deduction in temperature in 1 hr. = 5°C.

In 10 hrs. = 50° C.

Final temperature= 40°C - 50°C = -10°C.