In the given triangle,

Each angle = a°, so triangle is an equilateral triangle and a°= 60°

In the rectangle shaped figure,

Each angle = b° = 90° ( Sum of the angles of four-sided figure = 360°)

Now,
Quantity A = 2a + b
= 2 * 60° + 90°
= 210 °

Quantity B = 3a + b/3
= 3 * 60° + 90°/3
= 210°

Thus, the answer is C.