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A tenants consumed electricity first 10 days 10 unit/day next 10 days 20 unit/day and next 10 days 30 unit/day. What is the average unit consumed by tenants per day?

A tenants consumed electricity first 10 days 10 unit/day next 10 days 20 unit/day and next 10 days 30 unit/day. What is the average unit consumed by tenants per day? Correct Answer 20

⇒ Consumed electricity in first 10 days = 10 × 10 = 100 unit

⇒ Consumed electricity in next 10 days = 20 × 10 = 200 unit

⇒ Consumed electricity in next 10 days = 30 × 10 = 300 unit

Total consumed electricity in one month = 100 + 200 + 300 = 600 unit

∴ Average required = 600/30 = 20 unit/day

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