1.  Answer: Jim's mother is 35 years old now.

2. We call An's age as $x$, his aunt's age as $y$.

An is 1/3 as old as his aunt now:

$x = \frac{1}{3}y$

Ten years ago, the ratio of their ages was 1:7:

$(x - 10) = \frac{1}{7}(y - 10)$:

Now we can substitute $x$ with $y$:

$\Rightarrow frac{1}{7}(y - 10) = \frac{1}{3}y - 10$

Now we can solve the equation normally:

$y - 10 = (\frac{1}{3}y - 10) . 7$

$y - 10 = \frac{7}{3}y - 70$

$y - \frac{7}{3}y = 10 - 70$

$\frac{3}{3}y - \frac{7}{3}y = -60$

$\frac{-4}{3}y = -60$

$y = -60 . \frac{-3}{4}$

$y = 45$(years old)

$x = \frac{1}{3}y = \frac{1}{3} . 45 = 15$(years old)

So An is 15 years old now.

3. The amount of money Fiona paid:

$180000 - 60000 = 90000 = 30000$

The ratio in which they bought the flat:

Van : Willian : Fiona = $60000 : 90000 : 30000 = 2 : 3 : 1$

The amount of money that Van received after selling the flat:

$228000 : (2 + 3 + 1) . 2 = 76000$.

The amount of money that William received after selling the flat:

$228000 : (2 + 3 + 1) . 3 = 114000$

The amount of money that Fiona received after selling the flat:

$228000 - 114000 - 76000 = 38000$

So Van, William and Fiona received 76000, 114000 and 38000 respectively.