First, from Wrench + Wrench + Wrench = 15, since there are three wrenches, we get Wrench = 15 ÷ 3 = 5.
Second, in the equation Wrench + Gear + Gear = 25, substitute Wrench = 5, we have 5 + 2G = 25. Solving for G (Gear), we get 2G = 25 – 5 = 20, so G = 10.
Third, with the equation Gear – 2 Bolts = 8 and Gear = 10, substitute it in to get 10 – 2B = 8. Solving for B (Bolt), we find 2B = 10 – 8 = 2, so B = 1.
Finally, for the last equation Bolt + Wrench × Gear =?, substitute the values we found: 1 + 5 × 10. According to the order of operations (multiplication first), we have 1 + (5 × 10) = 1 + 50 = 51.
The missing number is 51. Try it yourself and see if you can crack it without these hints next time!
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