1. Harry wants to mix the flour of two different rates so that he can sell at the rate he wants. In what proportion he must mix the flour at Rs. 16.6 per kg with another flour at Rs. 16.45 per kg so that the mixture can be sold at the rate of Rs. 16.54 per kg?

2. A piece of wire when bent to form a circle will have a radius of 84 cm. If the wire is bent to form a square, the length of the side of the square is:

3. The ratio of the ages of two boys is 3:4. After 3 years, the ratio will be 4:5. The ratio of their ages after 21 years will be

4.

5. Two places P and Q are 162 km apart. A train leaves P for Q and simultaneously another train leaves Q for P. They meet at the end of 6 hours. If the former train travels 8km/hour. If the former train travels 8 km/hour faster than the other, the speed of the train starting from Q is