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$ \Rightarrow $ Number of packets=$\dfrac{{{\text{total quantity of milk}}}}{{{\text{capacity of one packet}}}}$

Put the given values and solve to get the answer.

Given, total quantity of milk=$10$ liters

Capacity of packets=\[250\]ml

We know that $1$ litre=$1000$ ml then

$ \Rightarrow $ $1$ ml=$\dfrac{1}{{1000}}$ litres

Then \[250\]ml=$\dfrac{{250}}{{1000}}$ litres

We have to find the number of packets to pack the milk.

We can use the formula-

$ \Rightarrow $ Number of packets=$\dfrac{{{\text{total quantity of milk}}}}{{{\text{capacity of one packet}}}}$

On putting the given values we get,

$ \Rightarrow $ Number of packets=$\dfrac{{10 \times 1000}}{{250}}$

On simplifying we get,

$ \Rightarrow $ Number of packets=$\dfrac{{10 \times 100}}{{25}}$

$ \Rightarrow $ Number of packets=$\dfrac{{2 \times 100}}{5}$

On multiplying the numerator we get,

$ \Rightarrow $ Number of packets=$\dfrac{{200}}{5}$

On dividing numerator by denominator, we get

$ \Rightarrow $ Number of packets=$40$

Capacity of packets =\[250\]ml

And we have to pack $10$ litre milk.

We know that $1$ litre=$1000$ ml=$250 \times 4$ml

This means that to pack one litre milk, we need $4$ packets of \[250\]ml

Then to pack $10$ litre milk we need the number of packets=$4 \times 10 = 40$ packs of \[250\]ml

Hence we need $40$ packets of \[250\]ml to pack $10$ litre milk.