Question
Two boys start running simultaneously around a circular
track of length 200 m from the same point at the speed of 16 km/hr and 20 km/hr respectively. When will they meet for the first time anywhere on the track if they are moving in opposite directions?Solution
Time taken to meet for the first time anywhere on the track, => Length of the track/relative speed => 200/ [(16 + 20) × 5/18] => (200 × 18)/ (36 × 5) = 20 seconds
A man spends 20% and 12% of his monthly salary on rent and transportation, respectively. Out of the remaining money, he spends 30% on food and 45% on en...
Meenu spent 20% of the salary on entertainment and 10% on makeup. She spent 20% of the remaining on the food and 50% of the remaining invested in mutual...
In a ward member election, a candidates secure 67% of the votes and is elected by majority of 5100 votes. The total number of votes polled is?
A 16-liter salt solution contains 6% salt. If 4 liters of water are evaporated by boiling the solution, what is the new percentage of salt in the remain...
In a class of 40 students and 8 teachers, each student got gifts that were 20% of total number of students and each teacher got gifts that were 15% of t...
When a train starts it is carrying 320 passengers. At the first station 12 passengers got down and 42 passengers get into the train. At the second stati...
A shopkeeper sells two articles for Rs.3000 each. On one, he gains 25%, and on the other, he loses 20%. What is the overall percentage gain or loss?
8.5 can be expressed in terms of percentage as:
- Anita spends 18% of her monthly income on rent and 70% of the rest on household expenditure. If she saves Rs. 1,890, then find her monthly income.
Seven years ago, the ratio of the ages of A and B was 4: 5. Eight years hence, the ratio of the ages of A and B will be 9:10. What is the sum of their p...
Relevant for Exams:
