The average of the marks of 25 students in a class is 70. If the marks of each student are doubled, find the new average?	Choose the correct choice.
A) 140  B) 100  C) 85  D) 160  E) 190

Rationale: "sum of the marks for the 25 students = 25 * 70 = 1750 . the marks of each student are doubled , the sum also will be doubled . the new sum = 1750 * 2 = 3500 . so , the new average = 3500 / 25 = 140 . answer : a"
Answer: A