Shoe, Man, Bottle puzzle

Shoe, Man, Bottle puzzle

Let S, M & B be Shoe, Man & Bottle respectively.

S + S + S = 30

3S = 30

S = 30/3

S = 10

M + M + S = 20

2M + 10 = 20

2M = 20 - 10

2M = 10

M = 10/2

M = 5

2B + 2B + 2B + 5 = 17

6B = 17-5

6B = 12

B = 12/6

B = 2

5 + (6 + 5 + 10) x 2

5 + 21 x 2

5 + 42

47