Thinking Skills
A breeder has 180 female rabbits. This year all but 7 of them had at least one litter. None had more than two…
Question 1 · Multiple choice
Question
A breeder has 180 female rabbits. This year all but 7 of them had at least one litter. None had more than two litters. In total, the rabbits had 263 litters altogether. How many of the female rabbits had exactly one litter?
Options
- A.83
- B.86
- C.90
- D.94
Correct answer
Explanation
Out of 180 rabbits, all but 7 had at least one litter. So the number that had litters is: 180 - 7 = 173
Let: x = number of rabbits with exactly 1 litter y = number of rabbits with exactly 2 litters
Then: x + y = 173 because 173 rabbits had litters altogether.
The total number of litters was 263, so: x + 2y = 263
Now subtract the first equation from the second: (x + 2y) - (x + y) = 263 - 173 y = 90
So 90 rabbits had 2 litters. That means: x = 173 - 90 = 83
So 83 rabbits had exactly one litter.
Method 2: If all 173 had exactly one litter, there would be 173 litters. But there are actually 263 litters, which is 90 more. Each rabbit with two litters adds 1 extra litter, so 90 rabbits had two litters. Then 173 - 90 = 83 had one litter.
