1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

10
br>Equation 28 + 8 + 92 = 10 can be derived from
twenty eight(t) + eight(e) + ninetytwo (n) = ten => 10

Similarly for equation,
1 + 9 + 8
One (o) + nine (n) + eight (e) => one (1)