Question

Can anybody help me with qn 6b?

Answer 1

400% • x = 1
400/100 • x = 1
4x = 1
Divide each side by four.
4x/4 = ¼
x = ¼

The value of x is ¼.

Answer 2

Since 400% is essentially 4 times as much of something, this is $4x = 1$.  Therefore, $x = \frac{1}{4}$