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