Question

2 supra 15 + 9 supra 15 + e = 1
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Answer 1

$\frac{2}{15} + \frac{9}{15} + e = 1$
$1 = \frac{15}{15}$

$\frac{11}{15} + e = \frac{15}{15}$
$e= \frac{15}{15}- \frac{11}{15}$
$e= \frac{4}{15}$

Answer 2

9+2=11
 15 supra 15 +e =11 supra 15
e=15-11=4

4 supra 15