Question

Bella visits a zoo where she observes the following:
The number of animals follow the rule of "add 5" and the number of birds follow the rule of "multiple of 3".

Animals	10	15	20	25
Birds	3	6	12	24

Find the number of animals and birds in the next step in the pattern.

• A. Animals: 30
  Birds: 48
• B. Animals: 35
  Birds: 48
• C. Animals: 30
  Birds: 46
• D. Animals: 40
  Birds: 48

Answer 1

The correct option is A Animals: 30

Birds: 48
It is given that number of animals follow the pattern "add 5".

Let's find the number of animals and represent it on a number line.

Observing, we get,
10 + 5 = 15
15 + 5 = 20
20 + 5 = 25
25 + 5 = 30
∴ The number of animals in the next step will be 30.

It is also given that the number of birds follow the pattern "multiple of 2".
Let us write the multiplication table.
3 $\times$ 1 = 3
3 $\times$ 2 = 6
6 $\times$ 2 = 12
12 $\times$ 2 = 24
And the next step will be:
24 $\times$ 2 = 48
So, the number of birds in next step is 48.