Spanner Gear Bolt Puzzle - with Answer

Spanner Gear Bolt Puzzle

ANSWER

41 is the answer
Explanation
Equation 1: 5 + 5 + 5 = 15 (Spanner = 5)
Equation 2: 5 + 10 + 10 = 25 (Gear = 10; Also note that the gear has 10 outside edges)
Equation 3: 10 - (1+1) = 8 (Bolt = 1)
Equation 4: 1 + (5 x 8) = 41 (In this equation the gear has only 8 outside edges, so  gear = 8)