sir I have a doubt about whether a problem is correct or not. I am posting the problem. ABC and DBC are both isosceles triangles on a common base BC such that A and D lie on the same side of BC.Are triangles ADB and ADC congruent?If so then if angleBAC=40 and angleBDC=100,then find ADB.The answer is given as 130.

Give chapter 5 lines and angles own questions for board exams 

Find the following percentage value:

1) 15% of 250.

Find the angle which is equal to its supplement.

Find the breadth of the rectangle whose length is 70 cm and perimeter 200 cm.

Convert 1 gallon into liters.

a. 3.05 liters

b. 3.78 liters

c. 4.05 liters

d. 4.78 liters