Question

There are 10 varieties of birds in a zoo, the number of each variety in double the number of another variety of the total number of birds is 5.115, find:

i) the number of birds in the first variety.
ii) the number birds in the last variety.​

Answer 1

I. 0.155. ii. 0.31

Explanation:

Let's solve this problem step by step.

Let's assume the number of birds in the first variety is x.

According to the problem, the number of birds in another variety is double the number of birds in the first variety. So, the number of birds in that variety is 2x.

The total number of birds in the zoo is given as 5.115. Therefore, we can write the following equation:

x + 2x + 10(x + 2x) = 5.115

Simplifying the equation:

x + 2x + 10x + 20x = 5.115

33x = 5.115

Dividing both sides by 33:

x = 5.115 / 33

x ≈ 0.155

So, the number of birds in the first variety is approximately 0.155.

Now, to find the number of birds in the last variety, we know that the number of birds in the last variety is double the number of birds in the first variety. Therefore:

Number of birds in the last variety = 2 * 0.155 = 0.31

Therefore, the number of birds in the last variety is 0.31.