Answer:
6 male wolves
Explanation:
Step 1
Find the total number of students
A biologist was observing a pack of wolves. There were 8 female wolves and the ratio of female wolves to male wolves was 4 : 5.
Ratio of Female to make
= 4:5
Sum of Proportion = 4 + 5 = 9
Let the total number of wolves = x
Hence
4/9 × x = 8
4x/9 = 8
Cross Multiply
4x = 9 × 8
4x = 72
x = 72/4
x = 18 wolves
The current number of male wolves = 5/9 × 18
= 10 wolves
Step 2
A little later some more male wolves arrived and the ratio was now 1 : 2.
The current ratio = 4:5
The new ratio = 1:2
For 4:5 = 1:2
We Multiply the number of females by 2 = 8 × 2
= 16 females
Hence,
16 - current number male of wolves
16 - 10
= 6 male wolves
Therefore, 6 more male wolves arrived.