Question

Earlier there were no rabbits in Australia. Rabbits were brought to Australia around the year 1780. At that time there were no animals in Australia which ate rabbits. So the rabbits began to multiply at a very fast rate. Imagine what they did to the crops!
The table shows how rabbits grew every year.

Time	Number of rabbits
Start	10
1 year	18
2 year	32
3 year	58
4 year	105
5 year
6 year

(1) After each year the number of rabbits was —
(a) a little less than double the number of rabbits in the last year.
(b) double the number in the last year.
(c) 8 more than the number in the last year.
(d) more than double the number of rabbits in the last year.
(2) At the end of year 6, the number of rabbits was close to

$\boxed{{}_{}}$ 400

$\boxed{{}_{}}$ 600

$\boxed{{}_{}}$ 800

(3) After which year did the number of rabbits cross 1000?

Answer 1

(1)
Correct: (a)
From the given table, we find that each year, the number of rabbits is a little less than double the number of rabbits in the last year.

(2)
After 6 years, the number of rabbits will be close to 400.

(3)
After 8 years, the number of rabbits will cross 1000. Thus, after the year 1788, the number of rabbits will cross 1000.