one gas cylinder is used to cook food for a family of 8 people for 30 days . If 4 guests join the family how long will the cylinder last?
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4
Answer:
20 days.
Step-by-step explanation:
As 8 people deplete the cylinder in 30 days,
Each day 1/30th of the cylinder is used.
As there are 8 people, each person uses 1/(30*8)th of the cylinder per day
= 1/240
When 4 guests are added, total no. of people= 12
As each person uses 1/240 of the cylinder
Each day, 12(1/240) of the cylinder is used.
= 1/20
So, it lasts for 20 days.
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