if the area of the trapezium is 1586 square centimetre and two parallel sides are the length of 10dm and 22cm respectively find the altitude
Answers
Answer:
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Step-by-step explanation:
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Step-by-step explanation:
Evaluate :
(i) 55% of 160 + 24% of 50 – 36% of 150
(ii) 9.3% of 500 – 4.8% of 250 – 2.5% of 240
Solution:
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 1
Question 2.
(i) A number is increased from 125 to 150 ; find the percentage increase.
(ii) A number is decreased from 125 to 100 ; find the percentage decrease.
Solution:
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 2
Question 3.
Find :
(i) 45 is what percent of 54 ?
(ii) 2.7 is what percent of 18 ?
Solution:
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 3
Question 4.
(i) 252 is 35% of a certain number, find the number.
(ii) If 14% of a number is 315 ; find the number.
Solution:
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 4
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 5
Question 5.
Find the percentage change, when a number is changed from :
(i) 80 to 100
(ii) 100 to 80
(iii) 6.25 to 7.50
Solution:
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 6
Question 6.
An auctioneer charges 8% for selling a house. If a house is sold for Rs.2, 30, 500; find the charges of the auctioneer.
Solution:
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 7
Question 7.
Out of 800 oranges, 50 are rotten. Find the percentage of good oranges.
Solution:
Total number of oranges = 800
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 8
Question 8.
A cistern contains 5 thousand litres of water. If 6% water is leaked. Find how many litres of water are left in the cistern.
Solution:
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 9
Question 9.
A man spends 87% of his salary. If he saves Rs.325 ; find his salary.
Solution:
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 10
Question 10.
(i) A number 3.625 is wrongly read as 3.265; find the percentage error.
(ii) A number 5.78 x 103 is wrongly written as 5.87 x 103; find the percentage error
Solution:
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 11
Question 11.
In an election between two candidates, one candidate secured 58% of the votes polled and won the election by 18, 336 votes. Find the total number of votes polled and the votes secured by each candidate.
Solution:
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 12
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 13
Question 12.
In an election between two candidates, one candidate secured 47% of votes polled and lost the election by 12, 366 votes. Find the total votes polled and die votes secured by the winning candidate.
Solution:
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 14
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 15
Question 13.
The cost of a scooter depreciates every year by 15% of its value at the beginning of the year. If the present cost of the scooter is
₹ 8,000; find its cost:
(i) after one year
(ii) after 2 years
Solution:
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 16
Question 14.
In an examination, the pass mark is 40%. If a candidate gets 65 marks and fails by 3 marks ; find the maximum marks.
Solution:
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 17
Question 15.
In an examination, a candidate secured 125 marks and failed by 15 marks. If the pass percentage was 35% ; find the maximum marks.
Solution:
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 18
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 19
Question 16.
In an objective type paper of 150 questions; John got 80% correct answers and Mohan got 64% correct answers.
(i) How many correct answers did each get?
(ii) What percent is Mohan’s correct answers to John’s correct answers ?
Solution:
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 20
Question 17.
The number 8,000 is first increased by 20% and then decreased by 20%. Find the resulting number.
Solution:
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 21
Question 18.
The number 12,000 is first decreased by 25% and then increased by 25%. Find the resulting number.
Solution:
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image - 22
Question 19.
The cost of an article is first increased by 20% and then decreased by 30%, find the percentage change in the cost of the article.
Solution:
Selina Concise Mathematics Class 8 ICSE Solutions Chapter 7 Percent and Percentage image -