There were 400 people at a concert. Half of them wore yellow T-shirts, 2/10 wore gray T-shirts, and the rest wore orange T-shirts. How many people wore gray T-shirts?

5. which description does not guarantee that a quadrilateral is a squar ajo is a parallelogram with perpendicular diagonals 0% has all sides congruent and all angles congruent o has all right angles and has all sides congruent 10% is both a rectangle and a rhombus 30%