Question

what should be added to 14 13/15 to get 27 1/7?

Answer 1

let the required no. be x
.:
$14 \times \frac{13}{15 } + x = 27 \times \frac{1}{7}$

Answer 2

14×13÷15+x = 27×1÷7
14×13×7+x = 27×15
1274+x = 405
x = 1274 - 405
x = -799