200 bulbs are used 4 hours per day and expenditure of 6 days is Rs. 40

1.	200 bulbs are used 4 hours per day and expenditure of 6 days is Rs. 40. Then how many bulbs should be used 3 hours per day so that expenditure of 15 days is Rs. 48 ?1. 722. 8003. 1284. 90
Answer» Correct Answer - Option 3 : 128 Given, 200 bulbs are used 4 hours per day and expenditure of 6 days is Rs.40 ⇒ 200 × 4 × 6 = Rs.40 ⇒ Rs.1 = 120 i.e cost of 120 unit power is Rs.1 ∴ Rs.48 consumes power ⇒ 48 × 120 = 5760 ∴ Bulb that are required 3 hrs/day for 15 days to consume 5760 unit power ⇒ Bulbs required = 5760/(15 × 3) = 128 ∴ 128 bulbs should be used 3 hours per day so that expenditure of 15 days is Rs. 48

200 bulbs are used 4 hours per day and expenditure of 6 days is Rs. 40. Then how many bulbs should be used 3 hours per day so that expenditure of 15 days is Rs. 48 ?1. 722. 8003. 1284. 90

Answer» Correct Answer - Option 3 : 128

Given,

200 bulbs are used 4 hours per day and expenditure of 6 days is Rs.40

⇒ 200 × 4 × 6 = Rs.40

⇒ Rs.1 = 120 i.e cost of 120 unit power is Rs.1

∴ Rs.48 consumes power

⇒ 48 × 120 = 5760

∴ Bulb that are required 3 hrs/day for 15 days to consume 5760 unit power

⇒ Bulbs required = 5760/(15 × 3) = 128

∴ 128 bulbs should be used 3 hours per day so that expenditure of 15 days is Rs. 48

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200 bulbs are used 4 hours per day and expenditure of 6 days is Rs. 40. Then how many bulbs should be used 3 hours per day so that expenditure of 15 days is Rs. 48 ?1. 722. 8003. 1284. 90

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