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Standard VII

Mathematics

Time and Work

A house has s...

Question

A house has six $40$ watt lamps that are on for $5$ hours a day and it has three $80$ -watt fans that are on far $10$ hours a day. The cost of electricity is Rs. $2$ per kilowatt-hour. For a $30$ -day month, the electricity bill of the house is

432

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216

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Solution

The correct option is C $216$
$T o t a l w a t h - h o u r u s e d b y l a m p s a n d f a n s = (6 \times 40 \times 5) + (3 \times 80 \times 10) = 1200 + 2400 = 3600 w a t t h o u r i n 1 d a y E n e r g e y u s e d i n 30 d a y m o n t h = 30 \times 3600 = 108, 000 c o s t = 108, 000 \times 10^{- 3} \times 2 216 R s$

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A house has six 40 watt lamps that are on for 5 hours a day and it has three 80-watt fans that are on far 10 hours a day. The cost of electricity is Rs. 2 per kilowatt-hour. For a 30-day month, the electricity bill of the house is

The correct option is C 216Totalwath−hourusedbylampsandfans=(6×40×5)+(3×80×10)=1200+2400=3600watthourin1dayEnergeyusedin30daymonth=30×3600=108,000cost=108,000×10−3×2216Rs

A house has six $40$ watt lamps that are on for $5$ hours a day and it has three $80$ -watt fans that are on far $10$ hours a day. The cost of electricity is Rs. $2$ per kilowatt-hour. For a $30$ -day month, the electricity bill of the house is