The GCF is 2a.
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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.
2a
b = 0.2 x 10a = 2aa/(2b) = a/(4a) = 1/4= 25%
To have a HCF, you need at least 2 numbers. There is no HCF in just 1 number.
the HCF is 6