Question
The average weight of ‘x’ persons is 50 kg. The
average weight of (x – 15) women is 40 kg, the average weight of (x – 20) children is 35 kg, and the average weight of (x – 24) men is 50 kg. Find the value of ‘x’, if total person is the sum of men, women and children.Solution
Total weight of x persons = 50 × x = 50x kg Total weight of (x – 15) women = 40 × (x – 15) = 40x – 600 kg According to the question, 50x = 40x – 600 + 35x – 600 + 50x – 1200 50x = 125x – 2400 125x – 50x = 2400 75x = 2400 x = 32
- The boat's downstream and upstream speeds are 24 km/hr and 16 km/hr respectively. If the time taken to cover a distance of (x + y) km upstream with stream ...
A boat takes 20 hours to go 200 km upstream. If the boat doubles its speed, it can cover 200 km downstream in 4 hours. Find the speed of the stream.
The ratio of the speed of boat in upstream to speed of boat in downstream is 7:9. If the boat can cover a total of 70 km upstream and 90 km downstream i...
The ratio of the distances traveled by a boat in upstream and downstream is 6:7, respectively, and the total time taken to cover the desired distance is...
The time taken by a boat to travel 'd' kilometers downstream is 8 hours, while the time taken to travel (d - 60) kilometers upstr...
A man can row at 6 kmph in still water. If the velocity of current is 4 kmph and it takes him 6 hour to row to a place and come back, how far is the place?
A Passenger boat started its journey from point A to B .After sometime when it is 156 km away from point B it is started to get sinking and passengers...
A man can row at 4 kmph in still water. If the velocity of current is 2 kmph and it takes him 5 hour to row to a place and come back, how far is the place?
If Boat goes 80 km upstream in 4 hours and 60 km downstream in 2 hours, then the speed of the boat in still water is
A man can go on a motor boat with a speed of 15 km/hour in still water, he goes to a certain distance upstream and come back to the starting point in a ...
Relevant for Exams:
