Discussion

Explanation:

Ratio of officers to workers = 1000 : 7000 = 1 : 7

Number of officers = 1/8 × 480 = 60

Alternately,
Let the number of officers be x

Number of workers = 400 – x

⇒ 10000 × x + 2000(400 - x) =3000(400)

⇒ 10000x + 800000 - 2000x = 12,00,000

⇒ 4x = 600 - 400 = 200

⇒ x = 50

∴ Number of officers = 50

Hence, option (a).

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