Answer :

First we have observed the pattern of the operation that is, for equations at odd places, the first term is being multiplied with 10 and the second term is multiplied with the first term and both are added. For equations, at even places, the second term is multiplied with 10 and the first term is multiplied with the second term and both are subtracted.

(2 × 10) + (7 × 2) = 34

(9 × 10) – (9 × 8) = 18

(6 × 10) + (6 × 3) = 78

(7 × 10) – (5 × 7) = 35

Hence 35 is the answer

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