Question
A spherical ball made of steel when dropped in mercury
container will –Solution
The density of steel usually ranges between 7.75 and 8.05 g/cm3 and the densityof mercuryis 13.534 g/cm3. Mercuryis denserthansteelthiswillmeanthatthebuoyant force is large enough to float the steel ball. Different materials usually have different densities, so density is an important concept regarding buoyancy, purity and packaging.
Average of 8 numbers is 50. If average of first four and last two numbers is 60 and 70, respectively then find the fifth number given that ratio of fift...
The average of 30 numbers is 55. The average of the first 15 numbers is 50 and the average of the last 12 numbers is 55. What is the average of 68, 74 a...
- A writer completed an average of 120 pages per week for the first 10 weeks. In the next 5 weeks, he completed ‘x’ pages per week, so that his overall a...
The average of 27 numbers is 20.The average of first 13 numbers is 15 and that of the last 13 numbers is 18. What will be the 27th number?
The current ages of Anoop and Bhuvan are in the ratio of 5:8. In 8 years, Bhuvan's age will be 60% greater than Anoop's age in 5 years. Determine the cu...
Average run scored by a batsman in first ‘x’ matches is 55. In next 12 matches he scored runs with an average of 90 so that his overall average incr...
The average height of each person in group 'C' having 25 people is 10 cm less than the average height of each person in group 'D' having 20 people. If t...
The average mark obtained by 110 candidates in a certain examination is 45. If the average marks of passed candidates are 50 and that of the failed cand...
The average age of a group of 24 persons is found to be 28 years. Later it is found that age of two of the persons is calculated as 32 and 64 instead of...
In a school, 30 boys scored an average of 76 marks while 40 girls scored an average of 88 marks. What is the average marks of all students together? (Ro...
Relevant for Exams:
