Marcus studies two stars in astrology class.
Star A has a diameter of 8.0 x 10^3 while Star B has a diameter of 2.0 x 10^7.

Marcus wants to find out how many times greater the size of the LARGER star
is compared to the smaller star.

Star A - 8.0 x 10^3
} - (3-7)
Star B - 2.0 x 10^7
|
4.0 x 10^4 = 40,000 times bigger

What mistake did Marcus make?