There are 90 total days in winter. If it snowed on 30% of the days, on how many days of winter did it snow?

27

Step-by-step explanation:

30%=0.3 in decimal form

90×0.3=27

27 days

Step-by-step explanation:

Well, there's two ways we could do this (which I do). One way is easier with a calculator, one is useful when you cannot use a calculator.

EASY CALCULATOR METHOD

30% as a decimal is 0.3, so if you multiply 90 by 0.3, you can easily find 30%. So:

90 x 0.3 = 27 days.

NON CALCULATOR METHOD

To find 10% of something, we divide the original value by 10. Therefore, we just need to find 10% and multiply that value by 3 to get 30%. So:

90/10 = 9 days (10%)

9 x 3 = 27 days (30%)

Either way both give you the same answer of 27 days.