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?
In a class test containing 10 questions, 5 marks are awarded for every correct answer
and (-2) marks are awarded for every incorrect answer and 0 for questions not
attempted.
(i) Mohan gets four correct and six incorrect answers. What is his score? 8
Reshma gets five correct answers and five incorrect answers, what is her score? 315
Heena gets two correct and five incorrect answers out of seven questions she
attempts. What is her score? O
(11)
Answers
Answered by
1
Step-by-step explanation:
6. Temperature of the room in the beginning = 40°C
Temperature after 1 hour
= 40°C – 1 × 5°C = 40°C – 5°C – 35°C
Similarly, temperature of the room after 10 hours
= 40°C – 10 × 5°C = 40°C – 50°C = -10°C
7. (i) Marks awarded to Mohan = 4 × 5
=20 for correct answers Marks awarded to Mohan = 6 × (-2)
= -12 for incorrect answers.
∴ Total marks obtained by Mohan
= 20 + (-12) = 20 – 12 = 8
(i) Marks awarded to Mohan = 4 × 5
=20 for correct answers Marks awarded to Mohan = 6 × (-2)
= -12 for incorrect answers.
∴ Total marks obtained by Mohan
= 20 + (-12) = 20 – 12 = 8
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