The sum of three consecutive odd numbers is $20$ more than the first of these numbers. What is the middle number?

Two baskets together have $640$ oranges. If $\frac{1}{5}$ of the oranges in the first basket are taken to the second basket,the number of oranges in both baskets becomes equal. The number of oranges in the first basket is:

The price of commodity $X$ increases by $40 \text{ paise}$ every year,while the price of commodity $Y$ increases by $15 \text{ paise}$ every year. If in $2001$,the price of commodity $X$ was $Rs. 4.20$ and that of $Y$ was $Rs. 6.30$,in which year will commodity $X$ cost $40 \text{ paise}$ more than commodity $Y$?

$21.9 \%$ of $(511.987 - 42.49) = \frac{?}{5.5}$

If $34N$ is a two-digit number divisible by $11$,then what is the value of $N$?

$(\sqrt{2209}-12) \times 5 = ?$