Answer:
100 years old
Step-by-step explanation:
The oldest person is 100 years old since that's the highest number showed on the stem & leaf plot.
16 problems.
100% divided by 20 questions.
100/20 is equal to 5, therefore each question is worth 5 points.
Grade of 80% divided by points per question.
80/5 is 16 so the student answered 16 questions correctly.
the value of x is 116
180-64=116
