This was not an easy puzzle @newcastle....well done on solving it. The middle number is derived by multiplying the top left by bottom right number...then multiplying the top right by the bottom right....then taking the first number and dividing it by the second...so (30x2)/(5x4)=3. Great job...SBD is on it's way!!
RE: Math Puzzle #8 - Be First to Answer Correctly and win SBD!