Nathan has a bottle of medicine. It holds a quarter of litre. He uses half of it. How many spoonfuls are left if each spoon holds 9ml?

Quarter litre = 250ml

He uses half so : 250/2 = 125ml

If each spoon holds 9ml -

125/9 which = 13.8, therefor 13 spoonfuls left

The bottle of medicine holds a quarter of litre.

Therefore, total volume = (1/4) l = 0.25 l = (250/1000) l = 250ml

Since he has used half, half of it is left.

Left = (1/2) * 250ml = 125 ml

How sponfuls left, if each is 9ml.

Number left = (125ml/9ml) = 13.89

The number left is just the whole number part, we drop the decimal part.

= 13 Spoonfuls left.