Answer: a
Step-by-step explanation:
Let x = the amount that Seini earned
Then x + 25 = the amount that Gavin
The amount Gavin earned would also = 425 - x (your directions asked you to have 2 equations.)
Together they earned 425:
x + (x + 25) = 425
2x + 25 = 425
2x = 400
Now divide both sides by 2 to find x.
Use all of this data to satisfy the directions.
100% because

is 6 and

is 9 meaning that the sum will come up at 6 or 9 also meaning that its 100%
48 = 12*4
12 = 12*1
The greatest common factor of 12 and 48 is 12