Question 21

Select the term that will come next in the following series.
57, 62, 31, 36, 18, ?

Solution

57, 62, 31, 36, 18, ?

First term

$$57 \ \underrightarrow{+5} \ 62$$

Second terms

$$62 \ \underrightarrow{half} \ \dfrac{62}{2}=31$$

Third terms

$$31 \ \underrightarrow{+5} \ 36$$

Fourth terms

$$36 \ \underrightarrow{half} \ \dfrac{36}{2} =18$$

Fifth terms

$$18 \ \underrightarrow{+5} \ 18+5 =23$$

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Select the term that will come next in the following series.57, 62, 31, 36, 18, ?