Question
A bag contains certain number of coins of different
denominations. The ratio of the number of Rs. 5 coins to Rs. 10 coins is 7 : 9, respectively and the ratio of number of Rs. 10 coins to Rs. 20 coins is 9 : 11 respectively. Find the total value of the Rs. 20 coins, if the total value of the Rs. 5 coins in the bag is Rs. 350.Solution
Given: Ratio of Rs. 5 coins to Rs. 10 coins = 7:9 Ratio of Rs. 10 coins to Rs. 20 coins = 9:11 Total value of Rs. 5 coins = Rs. 350 Let the number of coins be: Rs. 5 coins = 5x Rs. 10 coins = 9x Rs. 20 coins = y From the ratio of Rs. 10 to Rs. 20 coins: y=11x Total value of Rs. 5 coins: 5×5x=350 25x=350 x=14 Find number of Rs. 20 coins: y=11x=11×14=154 Total value of Rs. 20 coins: Total value=20×154=3080
- Ravi travels from town X to town Y. At 20 km/h he reaches 4 hours late, but at 50 km/h, he reaches 2 hours early. Find the distance between town X and town...
Train A takes 45 minutes more than train B to travel a distance of 450 km. Due to engine trouble speed of train B falls by a quarter, so it takes 30 min...
Two trains X and Y start at the same time in the opposite direction from two points P and Q and arrive at their destinations 25 and 16 hours respectivel...
The speed of a train is 108 km/hr and it takes 14 seconds to cross a man. Find the time taken by train to cross a platform if the ratio of the length of...
- A woman drove for 5 hours at a constant speed of 60 km/h and then drove another 2 hours at a constant speed of 90 km/h. Find her average speed for the whol...
Rohan and Tanuj move towards Dehradun starting from Delhi at a speed of 30 km/h and 50 km/h respectively. If Tanuj reaches Dehradun 300 minutes earlier ...
During the first 90 km of his trip, 'X' drove at a speed of 60 km/h. In the next 150 km, he increased his speed by 'y%' compared to his initial speed. F...
Driving at (4/5) of his usual speed, a man reaches his destination 36 minutes late. Find the time he normally takes to cover the distance.
There was a race of 2480 meters between P & Q on a circular track of 620 meters. First time they meet during the race after 4 minutes of starting of rac...
A and B are travelling towards each other with a speed of 30 km/hr and 40 km/hr. They started at same time and A covered 25 km less distance than B befo...
Relevant for Exams:
