<h3>The value of y is 4</h3>
<em><u>Solution:</u></em>
<em><u>Given system of equations are:</u></em>

We have to find value of y
From eqn 1,

From eqn 2,

Subtract eqn 3 from eqn 4
2x + 3y = 24
2x + y = 16
( - ) -----------------
2y = 8
y = 4
Thus value of y is 4
I'm certain there isn't a number that satisfies your conditions.
There's one multiple of 69 between 55 and 101: 69
And two multiples of 18 between 55 and 101: 72 and 90.
-4c = 12
divide both sides by -4
c = -3