find the remainder when the sum of 65 and 115 are divided by 15.

65+115=180

180/15=12

remainder = 0

$1.$ Write the equation:

$(65+115)$$\div$$5$

$2.$ Do the PEMDAS(parenthesis, exponents, multiplication, division, addition, subtraction) which you do the parenthesis first

$180\div \:5$

$3.$ Follow the multiplcation rule for $5$ which means the ones digit is $5$ or $0$

180

The remainder is $0$ because $5$ can perfectly fit $180$