A cistern is normally filled in 18 hours, but it takes 12 hours longer to fill because of a leak at its bottom. If the cistern is full, how long will it take to empty it?
Let pipe is A and leak is B A A+B 18 30 Let total tank = LCM(18,30) = 90 L 5 : 3 So 1 hr work of leak = 3 - 5 = -2 Therefore, the leak will drain all the water of the tank in 90/2 = 45 hours.
The average weight of 4 persons is 50 kg. The heaviest person’s weight is 20 kg more than the lightest person’s weight. If the average weight of the...
In an examination, the average marks obtained by the students is 85. After correcting the quantitative mistakes, the average of 100 students is reduced ...
The average of first two numbers and last two numbers of a set of six numbers is 70 and 45 respectively. If the overall average of all six numbers is 65...
The average score obtained by 10 students in a class test is 68 marks. The top place was shared by 3 people who got the same score. If the lowest score ...
The average weight of 10 books is 5 kg. If 6 new books are added, the new average increases by 3 kg. What will be the average weight of the 6 new books?
The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg andthat of B and C be 43 kg, then the weight of B is :
Average marks scored by Vineet in five subjects are 85. The average marks scored by him (excluding his highest and lowest marks) are 65 and lowest marks...
The average age of three children is 21 years. If their ages are in the ratio 3:5:6. Find the age of the youngest child.
The average of 10 observations is 46. It was realized later that an observation was misread as 42 in place of 142. The correct average is:
"In a group of four investors in stocks, the highest earner makes Rs. 5 lakh per month, while the lowest earner makes Rs. 2.4 lakh per month. Now, we wa...
