The average of three numbers is 45. The first number is thrice the second, and the second number is twice the third. Find the difference between the first number and the second number.
Shekhar walked a distace at a speed of 8 km/h. He was in a hurry, so on the return journey he travelled in an autorickshaw at a speed of 24 km/h. Find his average speed for the entire journey?
A shopekeeper purchased 20 dozen pens at the rate of ₹190 per dozen, and spent ₹200 as to and for expenses to the wholesale market. He sold the pens at the rate of ₹22 pen. Find his profit percentage?
A container has 30 litres of milk, from which 3 litres of milk is taken out and replaced with water. The process is done three times. What is the final ratio of the water and the milk in the container?
Two kinds of rice, the first costing ₹65 per kg and the second ₹95 per kg, are mixed together. Find the ratio in which the two types are mixed so that the mixture costs ₹83 per kg.
