This is simply 10a * a * a * a, or 10 * a * a * a * a. (Most people would consider the 10a4 form factored, since expanding it just makes it more complicated here.)
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Oh, dude, the Greatest Common Factor (GCF) of 4a and 10a is 2a. It's like the cool kid that both 4a and 10a can hang out with without any drama. So, if 4a and 10a were at a party, 2a would be the one they both vibe with.
The GCF is 2a.
2a
a 22yr old in only 10a your tiny
b = 0.2 x 10a = 2aa/(2b) = a/(4a) = 1/4= 25%