Question

a group of 7 people has enough food for a month a few more people joined them and the food lasted for only 21 days how many peoples joined them

Answer 1

Answer:

3 people joined them.

Step-by-step explanation:

Given,

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.

Answer 2

Answer:

correct answer is 3 people

Step-by-step explanation:

it is inverse proportion question so we calculate it and our total people coming = 10

so 7 is already there

so people come there = 10-7= 3

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