Question

You have a 1.5 litre bottle of water and drink 295 millilitres. Your friend drinks 135 millilitres. How much is left?

Answer 1

Convert liters to milliliters so that you have one unit for all of the amounts in the question.

1 liter is equal to 1000 milliliters, so multiply the 1.5 liters you have by 1000:

$1.5 * 1000 = 1500$

Since you drank 295 milliliters, and your friend drank 135 milliliters, you will subtract those values from the amount in the bottle:

$1500 - 295 - 135 = 1500 - 430 = 1070$

There is 1070 milliliters of water left in the bottle. 

If you want to find the amount remaining in the bottle in liters, divide the amount remaining by 1000 to convert milliliters to liters:

$1070 / 1000 = 1.07$

Converted back into liters, there is 1.07 liters of water left in the bottle.