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6. Written after 1 you get 16, which is 15 more than 1. Written after 5 you get 56, which is 51 more than 5.
2x-15 = 53
15 more than -3 = 12
4 more than 15 is 4 + 15 = 19.
A = J + 15 and A + J = 83, so 2J +15 = 83 ie J = (83 - 15)/2 = 34