Horse Horseshoe Boot Puzzle | with Answer

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ANSWER

21 is the answer

Explanation
Equation 1: 10 + 10 + 10 = 30 (Horse = 10)
Equation 2: 10 + (2+2) + (2+2) = 18 ( Horseshoe = 2)
Equation 3: 4 - (1+1) = 2 (Boot = 1)
Equation 4: 1 + (10 x 2) = 21