Question

7. 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?
(ii) Reshma gets five correct answers and five incorrect answers, what is her score?
(iii) Heena gets two correct and five incorrect answers out of seven questions she
attempts. What is her score?
8. A cement company earns a profit of ` 8 per bag of white cement sold and a loss of
5 per bag of grey cement sold.
(a) The company sells 3,000 bags of white cement and 5,000 bags of grey cement
in a month. What is its profit or loss?
(b) What is the number of white cement bags it must sell to have neither profit
nor loss, if the number of grey bags sold is 6,400 bags


Please with explanation
spam will be reported and also i will report 10 answers of them

Answer 1

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$\large\bf{\underline\blue{Question:- \: 1 }}$

(i) Mohan get 4 correct answer = 4×5 =20

He gets 6 incorrect answer = -126×(−2 )= −12

Total score = 20−12 = 8

Thus, mohan get 8 marks in the class test.

(ii) For 5 correct answer = 255×5 = 25

For 5 incorrect answer = -105×(−2)= −10

Total score = 25−10 = 15

(iii) Heena get 2 correct answer = 105×2= 10

Heena get 5 incorrect = -105×(−2) = −10

Total score = 10 −10 = 0

Thus, total score of heena is zero.

$\large\bf{\underline\blue{Question:- \: 2 }}$

As per the given information, we have

The profit earned by a cement company by selling white cement = Rs.8 per bag.

The number of bags of white cement sold is equal to 3000 bags.

The total profit earned by selling the given number of bags

= 3000 × 8 = 24000 rupees

The loss by a cement company by selling grey cement = Rs.5 per bag.

The number of bags of white cement sold is equal to 5000 bags.

Therefore, the total loss by selling the given number of bags is,

5000 × 5000 = 25000 rupees

Total loss is greater than total profit earned.

Thus, loss occurs.

25,000 > 24,000

The total loss of the cement company = Total loss by selling the given number of bags - Total profit earned by selling the given number of bags.

Substiting the corresponding values we get

Total loss = 25,000 - 24,000 = 1000

Thus the total loss of cement company is equal to Rs.1000.

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