Ratios and Percentages
Ratios and Percentages: Overview
This topic covers concepts, such as Estimation in Percentages, Part Percentages Always Add to a Whole, Comparing Quantities Using Percentages, Ratios and Percentages, and Comparing Quantities Using Ratios.
Important Questions on Ratios and Percentages
An alloy contains copper, nickel and rest zinc. Find the mass of zinc in of alloy.
If the simplest form of in a ratio is , then find the value of
Deepti went to school for days in a full year. If her attendance is , find the total number of days on which the school remained open.
If the ratio of to is , find .
Find the greatest value of if of .
In a class there are boys and girls. Find how many times is the number of boys to the number of girls.
The number of smartphones shipped to India was 4 million last year; this year it is increased to 9 million. The percentage increase in the number of smartphones shipped is_____ %.
Sarita bought a dress on 25% discount . If the cost of the dress was &rupee; 800, she paid &rupee;_____for the dress.
Last weekend was a long holiday, so Bannerghatta National Park had 1200 visitors. This weekend there were only 900 visitors. From last weekend to this weekend, the number of visitors who visited the national park fell by _____%.
When the mall opened at 11 am, 20 cubic metre of water was there in one of the tanks. After usage of 3 hours, 18 cubic metre of water was left in the tank. The percentage decrease in the volume of water in the tank is_____%.
In the morning spinach (Palak) bundle was sold at the rate of &rupee; 10 per bundle. In the evening the same was sold for &rupee; 8 per bundle. Which of the following expressions represents the percentage decrease?
Last year, in the month of June the rainfall received was 219.8 mm, and in September the rainfall was 152.6 mm. The percentage decrease in rainfall from June to September is_____%.
(Round your answer up to two decimal places.)
Sita used full cream milk with a calorie value of 62 calories per 100 ml. Her doctor suggested her to use skim milk instead, which has a calorie value of 43 calories per 100 ml. The percentage decrease in the number of calories per 100 ml is _____%.
(Round your answer up to two decimal places.)
The radio industry’s revenue has been estimated at &rupee; 150 crore for its first year, and has been growing at 10 percent over the last three years. If the same growth rate continues, the expected revenue for the fourth year is &rupee;_____crore.
A Japanese company manufactured 200000 motorcycles last year. This year they manufactured 250000 units. The percentage increase in production is _____ %.
There are 400 students in a school in Bangalore city. The school is planning to add more sections which will accommodate 30% more students to the total.
The total number of students the school will have in next year after new admissions is _____.
For a science project, 10 pages were to be typed. The typist started from first page with typing speed of 25 words per minute. By the time he reached the last page his speed increased to 45 words per minute. The percentage increase in his typing speed was_____ %.
The price of petrol increased overnight, from &rupee; 58 per litre to &rupee; 62 per litre. Shyam wants to find the percentage increase in the price of petrol. What should be the first step in calculating the percentage increase?
Both Anita and Sunita are happy with their marks, but who has performed better in Mathematics?
Which of these schools has performed better?
