Final answer:
Mike has 49 black balloons, and Sally has 31 times more, which equals 1,519 balloons. In total, they have 1,568 black balloons together.
Step-by-step explanation:
The student wants to know the total number of black balloons that Mike and Sally have. Mike has 49 black balloons, and Sally has 31 times more black balloons than Mike. To find out how many balloons Sally has, we multiply the number of Mike's balloons by 31:
49 balloons × 31 = 1,519 balloons
Now that we know Sally has 1,519 balloons, we can add the number of balloons Mike has to calculate the total:
Mike's balloons + Sally's balloons = Total
49 balloons + 1,519 balloons = 1,568 balloons
Therefore, Mike and Sally have a total of 1,568 black balloons.