A bag contains 6 red and 10 black marbles. If Mia picks a marble, records its color, and returns it to the bag 200 times, how many times can she expect to pick a black marble?

Can someone me and do the problem plz so i can understand it more better

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.

We have 339 ounces of jam to be divided up equally for 12 people how muny ounces will each person get