If 25% of 150 is equal to 700 percent of n, then n is equal to what number?

If 100% of a number = that number multiplied by one then 700% of a number would be that number multiplied by 7, so we just have to work backwards to get our answer.
0.25 * 150 = 37.5
37.5 / 7 = 5.35714285714
If you need to round it could look more like this:
5.357
5.36
or 5.4

Hope this helps.