8. The mean of five numbers is 25 . Abbie adds 5 to the first number, 10 to the second number, 15 to the third number, 20 to the fourth number and 25 to the fifth number to obtain a new set of five numbers. What is the mean of the numbers in the new set?
A 100
B 50
C 40
D 30
E 25
8. C Since the mean of the original five numbers is 25 , their total is $25 \times 5=125$. The total of the new set of five numbers is $125+5+10+15+20+25=200$. Therefore the mean of the new set of five numbers is $200 \div 5=40$.