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. While solving a problem, by mistake, Minakshi squared a number and then subtracted 25 from it rather than first subtracting 25 from the number and then squaring it. But she got the answer right. What was the given number?

3. I was born on 12 October, 1965 and my brother is 2 years 27 days older than me. On which day was he born if I was born on Tuesday?

4. 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

5.