Question 27
Select the number from among the given options that can replace the question mark (?) in the following series.
410, 210, 110, 60, 35, ?
Solution
$$\frac{410}{2}+5\ =\ 205+5\ =\ 210$$
$$\frac{210}{2}+5\ =\ 105+5\ =\ 110$$
$$\frac{110}{2}+5\ =\ 55+5\ =\ 60$$
$$\frac{60}{2}+5\ =\ 30+5\ =\ 35$$
$$\frac{35}{2}+5\ =\ 17.5+5\ =\ 22.5$$
So 22.5 will come in place of the question mark.
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