The value of 7 in 67098 is 7000 and the value of 7 in 74702 is 70000 or 700 so it is either 10 times or 1/10th of the the value.
Answer:
497.8
Step-by-step explanation:
500-2.23=497.77=497.8
I think the answer is D, I've been told it's D by many people.

First, find the number of females in the class. 
Then, just write the ratio. 