A large bottle contains number medical tablets each having a mass of 250 mg. The mass of all tablets is 1kg. Calculate the number of tablets in the
bottle.

First of all, this isn't physics. But, here's the

1 gram is a 1000 milligram and 250 milligram is 250 * 0.001 g which is 0.25 gram.

Since 1 kg is 1000 g, we divide 1000 by 0.25 and we get 1000 * 4 which is 4000.

There are tablets inside the bottle.

lexy is right because she has the labeled s

the part of the wave he is travelling on is the crest