Wow a shoutout!
The greatest common factor of two numbers is what it sounds like, the biggest number that divides both, i.e. the biggest number who has multiples that are the original numbers.
The way we do it is we factor each number and then we just pick out all the common prime factors and multiply them together. Here 56=2×2×2×7 and 92=2×2×23 so there are two factors of 2 in common, so a GCF of 2×2=4. In symbols:
GCF(56,92)=GCF(2^3(7), 2^2(23)) = 2^2 = 4
22.9 × 7.5 × 4.6 = 790.05
Rounded, 790 cubic meters
5 × 2 × 4 × (2 1/2)^3 = 5 × 2 × 4 × (5/2)^3 = 5^4 = 625 cubic inches
12 meters / (3 meters / hour) = 4 hours
