Between which pair of numbers is the exact product of 378 and 8?

378 times 8 is 3024.

This 3024 lies between 3000 and 3100, when we've rounded off both multiplicands to the nearest thousand.

In the first triangle 80+20+p=180 (since sum of all angles of a triangle is 180)so p= 80also in second triangle 55+45+q=180 (since sum of all angles of a triangle is 180)so q=80so we can conclude that p=80 degrees q=80 degrees so p=q=80 degreeshence option b is correct