Question
The average of three numbers is 66. When three more
numbers are included, the average increases by 6. Find the average of the numbers included.Solution
Sum of the 3 numbers = 66 × 3 = 198
New average = 66 + 6 = 72
Sum of 6 numbers = 72 × 6 = 432
Sum of new 3 numbers = 432 - 198 = 234
Required average = 234 ÷ 3 = 78
Average speed of ‘A’ during a 20-hour journey is 20 km/h. If he covered the first 200 km of his journey at a speed of 20 km/h, then find the speed a...
If a person walks 20% more than of his usual speed, reaches his distance 90 minutes before. If the destination is 459 km away, then the usual speed of a...
A cat, running at a speed of 54 km/h and positioned 240 meters ahead of a dog, can be caught by the dog in 6(2/3) seconds. Determine the time it takes f...
A car running with a speed of 55 km/hr takes 12 hours to go from 'A' to 'B'. If on the way back from 'B' to 'A', the car takes 20% less time than it tak...
Two cyclists start together from the same point and move along a straight road in the same direction. One moves at 18 km/h and the other at 24 km/h. Aft...
Pawan is able to finish 1/3rd of a task in 10 days. Qureshi, on the other hand, can complete the entire task in half t...
Rohit travels from his house to the market, which is 6 km away, by cycling. If he returns to his home by foot with speed of 4 km/hr and takes 30 minutes...
Two trains start from stations A and B towards each other at the same time. The distance between A and B is 360 km. One train runs at 40 km/h and the ot...
Paras starts chasing a Vipin, 5 hours after the Vipin starts running. Paras takes 6 hours to catch the Vipin. If the average speed of the Paras is 22 km...
A car running with a speed of ‘x’ m/sec makes 9 rounds of a circular field having radius 49 metres, in 12 seconds. Find the time taken by ca...
