- Calculator
- Flag
-
When the decimal point of positive number N is moved 2 places to the left, the result is equal to . What is the value of N?
Title
Algebraic Moved Decimal Point
Your Result
Correct
Difficulty
Very Hard
Your Pace
0:02
Others' Pace
2:42
Video Explanation
Text Explanation
Moving the decimal 2 place to the left—for example, changing 161.8 to 1.618—is identical to dividing the number by 100.
Thus, when N is divided by 100, it is equal to .
Cross-multiply
N(N − 1) = 600
We could do this algebraically, but let’s think about this. We want two consecutive integers that have a product of 600. What are the factors of 600?
600 = 6100 = 6455 = 2425
If N = 25, then it’s true that
0.25 = = =
Answer = 25
Related Lessons
Watch the lessons below for more detailed explanations of the concepts tested in this question. And don't worry, you'll be able to return to this answer from the lesson page.
