What Number Comes Next?

Answer: 60 or 65

Explanation:

There are three methods that you can use to arrive at the answers above and they are all valid:

Method 1:

Look at how much each number increases

Check the difference between each number:

• 10 to 15 → goes up by 5
• 15 to 25 → goes up by 10
• 25 to 40 → goes up by 15

You can see the increases are going up by 5 each time:

5, 10, 15… so the next increase should be 20.

So we add 20 to the last number:

40 + 20 = 60

Method 2

Check the Growing pattern in “adding multiples of 5”

Each step adds a bigger multiple of 5:

• 10 + (1 × 5) = 15
• 15 + (2 × 5) = 25
• 25 + (3 × 5) = 40

The next step should add:

4 × 5 = 20

So:

40 + 20 = 60

Method 3

Add the previous two numbers

This method works like a simple version of the Fibonacci sequence.
We add two numbers together to get the next one:

• 10 + 15 = 25
• 15 + 25 = 40

So we keep going:

• 25 + 40 = 65

Using this method, the answer is 65.