Question

38. Mohan deposits Rs 2,000 in his bank account and withdraws Rs 1,642 from it, the next day. If
withdrawal of amount from the account is represented by a negative integer, then how will you
represent the amount deposited? Find the balance in Mohan's account after the withdrawal.
39. Rita goes 20 km towards cast from a point A to the point B. From B. she moves 30 km towards
west along the same road. If the distance towards east is represented by a positive integer then,
how will you represent the distance travelled towards west? By which integer will you represent
her final position from A?
40. Write a pair of integers whose sum gives
(a) a negative integer (b) zero
(c) an integer smaller than both the integers
(d) an integer smaller than only one of the integers.
(e) an integer greater than both the integers.
41. Write a pair of integers whose difference gives
(a) a negative integer. (b) zero.
(c) an integer smaller than both the integers.
(d) an integer greater than only one of the integers.
(e) an integer greater than both the integers.
42. Write down a pair of integers whose
(a) sum is -3 (b) difference is -5
(c) difference is 2 (d) sum is 0
43. Write down a pair of integers whose:
(a) sum is - 7 (b) difference is --10 (c) sum is 0
44. Write a pair of negative integers whose difference gives 8.
45. Write a negative integer and a positive integer whose sum is -5.
46. Write a negative integer and a positive integer whose difference is -3.
47. Find: 4 x (-8), 8x (-2), 3 x (-7). 10 X (-1) using number hne.
48. Verify (-30) [13+ (-3)] = [(-30) x 13] + [(-30) (-3)]
49. In a class test containing 15 questions, 4 marks are given for every correct answer and (-2)
marks are given for every incorrect answer. (1) Gurpreet attempts all questions but only 9 of her
answers are correct. What is her total score? (i) One of her friends gets only 5 answers correct.
What will be her score?
50. An elevator descends into a mine shaft at the rate of 5 metre per minute. What will be its position
after one hour? If it begins to descend from 15 m above the ground, what will be its position after
45minutes?
51. 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?
52. In a test (+5) marks are given for every correct answer and (-2) marks are given for every
incorrect answer. (i) Radluka answered all the questions and scored 30 marks though she got 10​

Answer 1

Answer:

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Explanation:

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