Question

Q7.
(a) Rajiv gets 12 correct and remaining incorrect. What is his score?
(b) Mani gets 15 correct and rest he did not attempt. What is his score?
every hour. What will be the room temperature after 8 hours of starting the process?
integers?
minute. What will be the temperature of the water after 10 minutes?
In an examination, containing 20 questions, 4 marks are awarded for every correct answer and
(-2) marks are awarded for every incorrect answer. There are 0 marks for the questions not
08. A cooling machine requires that room temperature to be lowered from 30°c at the rate of 5°c
09. What will be the sign of the product if we multiply together 11 negative integers and 6 positive
Q10. The temperature of water in a geyser is 120°c. The temperature drops down by 10°c every​

Answer 1

7a. 32
7b. 60
8. -10 degree Celsius
9. Minus
10. 20 degree Celsius

Answer 2

Answer:

here is your answer mate...

Step-by-step explanation:

Suppose the number of correct answered questions be 'x' , then number of wrongly answer questions = (20-x).

It is given that for every correct answer 4 marks are awarded .

Number of marks scored for correct answers = 4x

And it is given that for every wrongly answered question ' 2 ' marks are deducted .

Number of marks to be deducted from the score = (20-x) × 2 = 40 - 2x ,

Total Score = 4x - ( 40 - 2x )

= 4x - 40 + 2x

= 6x - 40

But it is given that x = 12( correct answered questions)

= 6 × 12 - 40

= 72 - 40

= 32

Therefore.,

total score=32

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