A group of 7 people had enough food for a month. A few more people joined them and the food lasted for only 21 days. How many people joined them?
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9
Answer:
Step-by-step explanation:
For 7 people there were food 30 days
So, more the number of people less the number of days
Hence the given problem is in inverse proportion
So, the condition for inverse proportion is
a x b = a' x b' .....(i)
Where, a = 7 people
b = 30 days
a' = n people
b' = 21 days
Now,
In eq. (i)
=> a x b = a' x b'
=> 7 x 30 = n x 21
=> 210 = n x 21
=> n = 210/21
=> n = 10
Since they were now 10 in total.
Hence, 10 - 7 = 3
Therefore 3 people joined them.
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0
Answer:
Step-by-step explanation:
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