Hannah is 10 and 3/4 years old
Step-by-step explanation:
You don't have the question out for me to answer so could you add the question to this like a picture or something?
Answer:
y+30
Step-by-step explanation:
the sum of the numbers is 15y
the new sum after increase each number by 30 is 15y+450
the new mean 15y+450/15
= y+30
Answer: 19 questions wrong, 16 questions right
Step-by-step explanation:
