What should come in place of the question mark (?) in the following number series ?
Let the missing number be y
Here we can see that
$$400\div800$$ = $$\frac{1}{2}$$
$$200\div400$$ = $$\frac{1}{2}$$
$$100\div200$$ = $$\frac{1}{2}$$
$$50\div100$$ = $$\frac{1}{2}$$
As we can see that every time the divison is giving 0.5 and hence
$$y\div50$$ = $$\frac{1}{2}$$
y = 25
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