A number on subtracting 15 from it, reduces to its 80%, what is 40% of that number?40

Sure, let's solve this step by step:

1. Let's assume the number we are looking for is X.

2. According to the problem, if we subtract 15 from X, it becomes 80% of X. We can write this as an equation: X - 15 = 0.80X

3. To solve for X, we first get rid of the decimal in 0.80X by multiplying every term in the equation by 100. This gives us: 100X - 1500 = 80X

4. Next, we subtract 80X from both sides of the equation to get: 20X = 1500

5. Finally, we divide both sides of the equation by 20 to solve for X: X = 1500 / 20 = 75

So, the number we are looking for is 75.

6. The problem also asks for 40% of this number. We find this by multiplying 75 by 0.40: 75 * 0.40 = 30

So, 40% of the number is 30.