'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
B.
69
Given,x2y+xy2+x+y=63, and xy=6
xy(x+y)+(x+y=63
(x+y)(xy+1)=63
(x+y)(6+1)=63 (xy=6,given )
x+y=9
Sqauring both sides
(x+y)2=92
x2+y2+2xy=81
x2+y2=81-2(6)
x2+y2=81-12
x2+y2=69
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
Two positive numbers x and y are inversely proportional. If x increases by 10%, then y decreases by
%
%
10%
%
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%