If 60% of 70% of a number is 1680, find the number?

Sure, let's solve this step by step:

1. First, let's denote the unknown number as "x".

2. According to the problem, 60% of 70% of x is equal to 1680. We can write this as an equation: 0.60 * 0.70 * x = 1680.

3. Simplify the left side of the equation: 0.42 * x = 1680.

4. To solve for x, divide both sides of the equation by 0.42: x = 1680 / 0.42.

5. After performing the division, we find that x = 4000.

So, the number is 4000.