21.

The number of observations in a survey is 40. If the mean of the first 10 observations is 4.5 and that of remaining is 3.5, then the mean of the whole survey is

• 2.82
  
  

• 3.80
  
  

• 3.75
  
  

• 4.25

A right circular cylinder of maximum volume is cut from a solid cube of edge 14 cm. The total surface of the cylinder is

• 924cm²
  
  

• 1134cm²
  
  

• 2464cm²
  
  

• 616cm²

There are 50 numbers. Each number is subtracted from 53 and the mean of the numbers so obtained is -3.5. The mean of the given numbers is

• 49.5

• 53.5

• 46.5

• 56.5

Ten observations 5, 9, 14, 15, x+1, 2x-13, 28, 30, 32, 34 are written in ascending order.The median of the data is 24. Find the value of x.

• 20
  
  

• 19
  
  

• 21
  
  

• 16

44 cows can graze a field in 9 days. How many less/more cows will graze the same field in 12 days

• 15 cows more
  
  

• 11 cows more
  
  

• 11 cows less
  
  

• 15 cows less

Which of the following statements is true?

• Different branches of Mathematics, viz., algebra, geometry, etc., are dependent on each other
  
  

• Equations can be learnt without learning arithmetic
  
  

• Congruence of triangles can be learnt without learning algebra
  
  

• Statistics can be learnt without learning algebra

Which among the following is the best pedagogical way to teach Mathematics?

• Motivate the learners to develop their existing capabilities
  
  

• Find the weakness and teach only those parts
  
  

• Find the gaps and address only them
  
  

• Teach every students with the same approach

If A's salary is 20% more than that of B, then how much percent of B's salary less than that of A?

• 25%
  
  

• 18%
  
  

• 20%
  
  

• 15%

The sum of two natural numbers is 8. Determine the numbers if the sum of their reciprocals is $\frac{8}{15}$?

• 1,7

• 4,4

• 2,6

• 5,3

The expenditure of the family in a month is given in the figure below. If the difference of expenditure between education and travel is$₹$4000, then what will be the total income of the family?

• $₹$50000

• $₹$40000

• $₹$60000

• $₹$30000