Since 3 is a Prime number, the highest common factor of the two numbers is 1.
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20, because 15 divides by 5 is 3, And 3 times 8 is 24, And 24 minus four is 20.
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No - neither number is a prime ! 42 divides by 2, 3 & 7 - and 93 divides by 3 !
Note that 20 exactly divides 40 because 40 / 20 = 2. Then, the GCD of 20 and 40 is 20.