A = B – 3 ..(i) D + 5 = E ..(ii) A + C = 2E ..(iii) B + D = A + C = 2E ..(iv) A + B + C + D + E = 150 ..(v) From Eq. (iii), (iv) and (v), we get: 5E = 150 ⇒ E = 30 Putting E = 30 in Eq. (ii), we get: D = 25 Putting E = 30 and D = 25 in Eq. (iv), we get: B = 35 Putting B = 35 in Eq. (i), we get: A = 32 Putting A = 32 and E = 30 in Eq. (iii), we get: C = 28