Question

Last week John’s hamster drank 45 mL of water. This week he drank 25 mL of water. By what percent did the hamster’s intake of water decreased?

Answer 1

Percentage decrease is 55%.

Explanation:

Given the following data;

Original (old) number = 45mL

New number = 20mL

`Percentage \; decrease = (change\; in \;amount)/(original\;number) * 100`

Change in amount = 45 - 20 = 25

Substituting into the equation, we have;

`Percentage \; decrease = (25)/(45) * 100`

`Percentage \; decrease = 0.55 * 100`

`Percentage \; decrease = 55%`

Therefore, the hamster’s intake of water decreased by 55%.