The average marks obtained in a class of 50 students is 70%. The average of first 25 is 60% and that of 24 is 80%. What is the marks obtained by the last student?

If a² + a + 1 = 0 then the value of a⁹ is. 

The sum of three numbers is 252. If the first number is thrice the second and third number is two-third of the first, then the second number is

The ratio of the areas of two isosceles triangles having the same vertical angle is 1 : 9.The ratio of their heights is -

Study the given graph carefully to answer the questions that follow:

If carpenter X and carpenter Y were to make a chair together how many days would they take?

If 1.5 a=0.04 b then $$ {b-a\over b+a}$$.

In an exam of 100 marks, the average marks of a class of 40 students are 76. If the top 3 scorers of the class leave, the average score falls “down by 1. If the other two toppers except “the highest topper scored not more than 85. “then what is the minimum score the topper can score?

The angles of elevation of the top of a tower as observed from the bottom and top of a building of height 80 metre are 60° and 45° respectively. The distance of the base of the tower from the base of the building is:-