Get solution of all questions of RS Aggarwal Class 8 Maths Chapter 12 Exercise 12B (Direct and Inverse Proportion).
RS Aggarwal Class 8 Ex. 12b Solution
1: Observe the tables given below and in each case find whether x and y are inversely proportional:
2: If x and y are inversely proportional, find the values of x1, x2, y1 and y2 in the table given below:
3: If 35 men can reap a field in 8 days, in how many days can 20 men reap the same field?
4: 12 men can dig a pond in 8 days. How many men can dig it in 6 days?
5: 6 cows can graze a field in 28 days. How long would 14 cows take to graze the same field?
6: A car takes 5 hours to reach a destination by travelling at the speed of 60 km/h. How long will it take when the car travels at the speed of 75 km/h?
7: A factory requires 42 machines to produces a given number of articles in 56 days. How many machines would be required to produce the same number of articles in 48 days?
8: 7 taps of the same size fill a tank in 1 hour 36 minutes. How long will 8 taps of the same size take to fill the tank?
9: 8 taps of the same size fill a tank in 27 minutes. If two taps go out of order, how long would the remaining taps take to fill the tank?
10: A farmer has enough food to feed 28 animals in his cattle for 9 days, How long would the food last . If there were 8 more animals in his cattle?
11: A garrison of 900 men had provisions for 42 days. However, a reinforcement of 500 men arrived . For how many days will the food last now?
12: In a hostel, 75 students had food provision for 24 days. If 15 students leave the hostel for how many days would the food provision last?
13: A school has 9 periods a day each of 40 minutes duration. How long would each period be if the school has 8 periods a day, assuming the number of school hours to be the same?
14: If x and y vary inversely and x = 15 when y = 6, find y when x = 9.
15: If x and y vary inversely and x = 18 when y = 8, find x when y = 16.
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