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**Given,**

**P+P+O = 14 ⇒ 2P+O=14 ⇒ O=14-2P ---------- 1**

**N+N+M = 20 ⇒ 2N+M=20 ⇒ M=20-2N ---------- 2**

**O+M+P = 12 ------- 3**

**P+M+N = 18 ------- 4**

**1 in 3**

**14-2P+M+P = 12**

**M-P = 12-14**

**M-P = -2**

**P = M+2 ----------- 5**

**2 in 4**

**P+20-2N+N = 18**

**P-N = 18-20**

**P-N = -2**

**P = N-2 --------- 6**

**Equating P values, we get M+2=N-2 ⇒ N = M+4 in 2**

**M = 20-2M-8**

**3M=12**

**M=4**

**So, N= M+4 = 4+4 = 8**

**M,N values in 4**

**P+4+8 = 18**

**P+12 = 18 ⇒ P = 18-12**

**P = 6**

**Placing M, P values in 3**

**O+4+6 = 12**

**O = 12-10**

**O = 2 is the answer**