Each interior angle of a regular polygon is 144⁰. The number of sides of the polygon is 

$$ {tan7°tan23°tan60°tan67°tan83°}$$ is equal to-

The length of a rectangle is 6 cm more than its width and its perimeter is 100 cm. If the area of this rectangle is closest to the area of a circle, then what is the circumference of that circle?

Study the following table and answer the equation:
Number of cars sold by dealers A, B, C, D and E during first six months of 2018.

The ratio of the total number of cars sold by dealer B in January, April and June to the total number of cars sold by dealers A and D in March is:

Directions :- Refer the graph and answer the given questions.
 The following line graph shows the number of products sold by company A and B during six years.

What is the ratio of the total number of products sold by A and B together in 2012 to the total number of products sold in these two companies together in 2015 ?

Each internal angle of regular polygon is two times its external angle. Then the number of sides of the polygon is: 

The average weight of 24 students is 35 kg. If the weight of teacher is added the average increased by 400 gram. What is the weight of the teacher?

If a + b: b+c : c+a= 6:7:8 and a + b+c= 14, , then the value of c is :