1 Two variables x and y are such that the ra o = constant, then. Inverse proportion Direct proportion x and y are equal None

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1 CBSE Practice papers VARIATION AND DIRECT INVERSE PROPORTION class-8-mathematics Number of Questions: 30 For Answers and Solutions, Go to -> Select your grade -> Select Learn ->Select Subject Page link Two variables x and y are such that the ra o = constant, then and y are said to be in 2 If xy = constant, the variables x and y are Inverse proportion Direct proportion x and y are equal ne In direct proportion Inverse proportion t related to each other ne 3 A bus gives a mileage of 120 kms with 20 litres of diesel. How much distance will it cover with 50 liters of diesel. 240 km 300 km 250 km 320 km 4 If the cost of 45 surf packets of same size is Rs Find the cost of 25 such packets. Rs. 400 Rs. 300 Rs. 600 Rs meters of a cable costs Rs How much cable can we purchase with Rs metres 15 metres 30 metres 40 metres x y x

2 6 A pole of 10 m height casts a 15 m long shadow. Find the height of building that casts a 45 m long shadow under similar condi ons. 30 metres 35 metres 40 metres 45 metres 7 A Truck travels 20 km in 15 minutes. If speed remains the same, then a) How much me will it take to cover 160 km. 1 b) How much distance can if travel in 2 hours. 2 2 hrs, 200 kms hours, 150 km 1 hour, 100 km ne of the above The value of variables x and y are given below Is x and y are directly propor onal? 9 The value of variables x and y are given below Are x and y directly propor onal? 10 Two ci es are 3 cm a part in a map. The scale of the map is

3 1 = Find the actual distance between the ci es? 5 km 6 km 4 km 7 km 11 Taxi hire rates at a railway sta on are given below. Hours(x) Taxi charges(y) hours Rs hours Rs hours Rs hours Rs.700 Check if the hire rates per hour are in direct propor on men can construct a compound wall of length 24 m in a day. How many men should be employed for construc ng a wall of length 36 m If 3 men or 6 women can earn Rs. 810 per day, then how much would 10 men and 12 women earn per day. Rs Rs Rs Rs If a pipe can fill a tank of capacity 100 litres in 2 hours. How long will it take to fill a tank of capacity 250 litres. 4 hours 5 hours 6 hours 10 hours 15 The values of variables x and y which are directly propor onal is given below. Find the values of y 1 and y

4 y 1 8 y 2 72, 96 70, 90 80, 90 82, The rela ve values of variables x and y are given below. Find whether x and y are inversely propor onal If x and y are inversely propor onal, then find the values of x, y where rela ve values of x and y given below x y , 8 14, 7 16, If 35 men can do a piece of work in 8 days, how many days can 20 men do the same work men can build a wall in 20 days. How many men required to build the wall in 10 days

5 20 If x and y vary inversely and x = 20, when y =12, then find y when x = pumps are required to fill a tank in 2 hours 30 minutes. How long does it take, if only 4 pumps of same type are used hours 6 hours hours 7 hours A bus takes 6 hours to reach the des na on with a speed of 60 kmph. How long will it take it the bus travels with a speed of 90 kmph. 3 hours 5 hours 4 hours 6 hours 23 Ravi has enough money to buy 6 kg of rice at a price of Rs. 50 per kg. How much can he buy for the same amount if the price is increased to Rs. 60 per kg. 5 kg 4 kg 3 kg 6 kg 24 A camp has food stock for 400 people for 80 days. If 100 more people join the camp, how long will the stock last? 60 days 64 days 65 days 70 days 25 Mess charges for 40 students for 30 days is Rs. 12,000. How much will be the mess charge for 30 students for 15 days. Rs. 500 Rs Rs Rs workers working 6 hours per day can finish a piece of work in 6 days. If each worker works 8 hours a day, find the number of workers required to finish the same piece work in 3 days

6 27 8 painters can paint a wall of 160 m long in 4 days. How many painters are required to paint 240 m long wall in 3 days Rice cos ng Rs is required for 12 members for 15 days. What is the cost of rice required for 16 members for 24 days. Rs.7500 Rs Rs Rs men can lay a road 45 km. long in 2 days. In how many days can 10 men lay a road of 75 km long? men can dig a canal m long in 24 days. How many men are required to dig a canal of 2250 m long in 12 days For Answers and Solutions, Go to -> Select your grade -> Select Learn ->Select Subject MicroMerits.com is an innovative practice and assessment platform. The methodical practice sharpens your talent. We provide Practice worksheets and Practice papers based on CBSE syllabus. These printable Worksheets and Practice Papers are available for FREE download Helps students to score very good marks in their board exams. Also useful for students taking part in various competitions like NTSE, Olympiads, KVPY and for future JEE/NEET exams

RATIO, PROPORTION AND UNITARY METHOD

8 RATIO, PROPORTION AND UNITARY METHOD 1. The males and females in a village are in the ratio 8 : 3. If the number of females is 405. How many males are there in the village? Ans. Let number of males be