Answer :
9 × 27 + 2 × 31 - 28 = n
9 × 27 + 2 × 31 - 28 =
243 + 2 × 31 - 28 =
243 + 62 - 28 =
305 - 28 =
277
n = 277
9 × 27 + 2 × 31 - 28 =
243 + 2 × 31 - 28 =
243 + 62 - 28 =
305 - 28 =
277
n = 277