Medicine is packed in boxes, each weighing 4 kg 500g. How many such boxes can be loaded in a van which cannot carry beyond 800 kg?

A batch of bottles were packed in 25 boxes with 12 bottles in each box.If the same batch is packed using 20 bottles in each box,how many boxes needed?

Two big packets of books contain 84 and 105 books respectively.These books are to be packed into small packets which will contain same number of books.How many maximum number of books can be packed in each small packet?

Boiling point of water at 750 mm Hg is 96.63 degree celsius. How many sucrose is to be added to 500 g of water such that it boils at 100 degree celsius ? Molal elevation constant for water is 0.52 kg mol^-1 .

You have a bag of cotton and an iron bar, each indicating a mass of 100 kg when measured on a weighing machine. In reality, one is heavier than other. Can you say which one is heavier and why ?

A fruit grower can use two types of fertilizer in his garden, brand P and brand Q. The amounts (in kg) of nitrogen, phosphoric acid, potash, and chlorine in a bag of each brand are given in the table. Tests indicate that the garden needs at least 240 kg of phosphoric acid, at least 270 kg of potash and at most 310 kg of chlorine. If the grower wants to minimise the amount of nitrogen added to the garden, how many bags of each brand should be used? What is the minimum amount of nitrogen added in the garden? If the grower wants to maximize the amount of nitrogen added to the garden, how many bags of each brand should be added? What is the maximum amount of nitrogen added?