I need help for this question cans someone help thx

Emma will roll two number cubes labeled 1 through 6. she will record the sum of the two numbers after each roll. she will roll the two cubes 540 times. how many times should emma expect the sum to equal 5?

For how answer my question this will be the last question can you answer in math subject

The sum of two numbers is 12 and their difference is 18 what are the two numbers