'Buy three, get one free.' What is the percentage of discount being offered here?

• 25
  
  

• 20
  
  

• 28.56
  
  

• 33.33

Given linear equations, I, II and III, a learner is not able to solve III algebraically. The most likely area of difficulty is that the learner has not understood

• that two equations can be solved by method of substitution
  
  

• the method of solving equations using graphs
  
  

• that both the equations in III can be altered by multiplying with suitable numbers
  
  

• that two equations can be added or subtracted to solve then

While teaching ratio and proportion, Ms Rama demonstrated some computer operations on the screen - 'copy and paste' and 'copy and enlarge' or 'copy and reduce'. This activity maybe

• formative assessment activity

• fun activity to pass time

• pre-content activity to introduce ratio

• post-content activity

If xy=6 and x²y+y²x+x+y=63, then the value of x²+y² is

• 61

• 69

• 23

• 55

How many times will I be writing 2 if wrote down numbers from 11 to 199?

• 38

• 39

• 36

• 37

The symbol  drawn to any size means a + 4 and the symbol  drawn to any size means b², where a and b are numbers. Then, the value of

• 32

• 9

• 75

• 35

The expression x²-y²+x+y+2yz-z has one factor, which is 

• x+y-z+1

• x-y-z+1

• y-x+z

• x-y+z+1

48.

Two positive numbers x and y are inversely proportional. If x increases by 10%, then y decreases by

• $\frac{100}{11}$%

• $\frac{10}{11}$%

• 10%

• $\frac{2}{11}$%

If $\sqrt{1225 }$= 35, then find the value of $\sqrt{12.25}$ +$\sqrt{ 0.1225}$ + $\sqrt{0.001225}$.

• 38.85

• 3.885

• 388.5

• 0.3885

A's income is 150% more than that of B, than how much per cent is B's income less than that of A?

• 50%

• 60%

• 12.5%

• 25%