The number of students in the educational system and the number of eductional institutions.

$9$

P.e.: the number of students at "Spec. voortgezet onderwijs" in 2002/'03 suddenly becomes $0$, while the number of students in "Voortgezet onderwijs" increases strongly.
And the number of schools in the categories "Speciale scholen" and "Voortgezet onderwijs" increases in 2002/'03.

In 2002/'03: $913671/692\approx 1320$ students.
In 2007/'08: $941469/658\approx 1431$ students.

$13$ universities. An average of $166299/13\approx 12792$ students per university in 2000/'01.
An average of $212728/13\approx 16364$ students per university in 2007/'08.

The number of hbo-institutions decreased from $62$ to $51$.
On average there were $\frac{312698}{62}\approx 5044$ studenten per hbo-instelling in 2007/'08.

On average there were $\frac{374377}{51}\approx 7341$ students per hbo-institution in 2000/'01.

Go Ahead Eagles (Deventer) leads with $39$ points out of $18$ matches.

$12\cdot 3+3\cdot 1+3\cdot 0=39$. A team gets $3$ points per match won and $1$ point for a draw.

$597$ goals (total number of goals scored)

The goal difference is the differende between the number of goals scored and the number of goals against. De Graafschap has a goal difference of $36-14=22$; SC Cambuur has a goal difference of $44-29=15$.

For De Graafschap (goal average 2,57) en Cambuur (goal average1,52) it would make no difference.
But FC Oss would be ranked above FC Omniworld. And FC Eindhoven above Fortuna Sittard.

Yes, it seems to be right. The number of parent birds remains 2, and they can only gather so much food per day.

Apparently the parent birds try harder with more young.
With $12$ young they even collect $12\cdot \mathrm{0,70}=\mathrm{8,40}$ gram per day.

More young in one nest means that they can profit from each other's heat production.

Make a table of the total heat production. With $12$ young only $\mathrm{0,177}$ kcal of heat production per young is needed to stay warm. The rest can be used to grow.

See table.

$\frac{612}{6500}$

$\frac{53}{665}$