$27, 28, 25, 25, 23, 22, 21, ?$

20

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21

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19

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18

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24

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Solution

The correct option is E $19$
There are two alternate series:
Series I : $27, 25, 23, 21$ (following $- 2$ pattern)
Series II : $28, 25, 22, 19$ (following $- 3$ pattern).

Suggest Corrections

Body mass index	18-19	19-20	20-21	21-22	22-23	23-24
No. of persons	5	12	18	25	16	4

Age (in years)	$18$	$19$	$20$	$21$	$22$
No. of boys	$14$	$10$	$20$	$24$	$12$