### Instruction: Which of the following is closest to $\frac{504.6739}{49.8+1.021789}$?

A. 10
B. 8
C. 5
D. 3
E. 1

Express your answer as A, B, C, D, or E.### Response: To estimate this fraction, I want to simplify the numerator and the denominator by rounding them to easier numbers.
For the numerator, 504.6739 is very close to 505, so I'll use that.
For the denominator, 49.8 is very close to 50, and 1.021789 is very close to 1, so I'll use 50+1=51.
So my fraction becomes $\frac{505}{51}$.
To find the closest integer to this fraction, I can use long division or a calculator.
I'll use a calculator and enter 505/51.
The calculator gives me 9.902, which is very close to 10.
So the answer is A.