Question

Sum of GCD of 18 & 27 and 77 & 132 is

Answer 1

First, find GCD of $18$ & $27.$


$18=2\times 3\times 3$
$27=3\times 3\times 3$
GCD is $3\times 3=9$.

Now, for $77$ & $132$ we get,


$77=7\times 11$
$132=2\times 2\times 3\times 11$
$\therefore$ GCD is $11$.
Sum of GCDs $=9+11=20$.