Instructions

What should come in place of the question mark (?) in the following number series ?

Question 148

800, 400, 200, 100, 50, ?

Solution

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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