Angle sum property of a polygon

Q.

The ratio between the number of sides of two regular polygons is $1:2$. The ratio of the measures of their interior angles is $3:4$. How many sides are there in each polygon?

1. $7$ and $10$
2. $10$ and $12$
3. $5$ and $15$
4. $5$ and $10$

Q.

The angles of a quadrilateral are $x^{\circ },(x-10{)}^{\circ },(x+30{)}^{\circ }$ and $(2x{)}^{\circ }$. Find the value of the greatest angle.

1. ${180}^{\circ }$

2. ${68}^{\circ }$

3. ${136}^{\circ }$

4. $\text{none of these}$