Maths Simple Equation part 10 (Application of Simple Equation) CBSE Class 7 Mathematics VII Video Lecture | Extra Documents & Videos for Class 7

hello friends this video on simple
equations part 10 is brought to you by
exam feel calm no more fear from exam
now look at simple equations in real
life examples that is how we make use of
simple equations to solve real-life
problems that we encounter let us look
at the first example Rogan subtracts
thighs the number of notebooks he has
from 15 he finds the result to be eight
how many notebooks Rohan has so first of
all we need to set up the equation so
how do we set up the equation we
considered that value which do not which
we do not know as a variable so what do
we do not know here
how many notebooks Rohan has so let us
assume that the number of notebooks that
Rohan has is equal to X now let us
establish the expression based on the
condition that is given in the question
so the condition is that rogen subtract
thrice the number of notebooks he has
from 50 so he is subtracting thrice the
number of notebooks he has that is 3x he
is subtracting 3x from 50 and when we
subtract 3x from 50 what is the result
that he gets the result is 8 so
basically 50 minus 3x is equal to 8 so
this is the equation now how do we find
the value of x by solving this equation
so how do we solve this equation we keep
the variables on the left hand side and
we start moving the constants to the
right hand side so this becomes 8 minus
15 therefore minus 3x is equal to minus
42 or we can say X is equal to minus 42
divided by minus 3 so minus minus will
be plus and this 3 into 14 is equal to
42 so X is equal to 14 that means Rohan
has 14 X troops let's look at the next
example
Tony scored twice as many runs as coolie
together their runs fell too short of a
double century how many runs did each
one score so we do not know the scores
of each of them so let us assume that
who he had scored X runs
so if Cole is code X runs how many runs
Tony scored on his put twice as many
runs as Kohli
therefore Tony's scored 2 X right now
the next condition in the question is
that together their Grunsfeld too short
of a double century so total runs of
Dhoni and Cody what would be their total
runs together so total runs would be X
plus 2 X so X plus 2 X is nothing but 3
X this is 2 X plus 1 X so that is 3 X
now as for the question this 3x is less
than double century 1 century is 100 so
double century is 200 so the question
see is that this 3 X is less than 200 by
2 that means the difference between 200
and 3x is equal to 2 so this is our
simple equation so we need to solve this
so how do we solve this it becomes minus
3x is equal to 2 minus 200 or we can say
minus 3x is equal to minus 198 or X is
equal to minus 198 divided by minus 3 so
minus minus would be plus so this is 3 6
2 18 3 6 to 18 so X is the value of x
will be 66 so this is the score of
koley's kony scored 66 runs and how many
runs did Toni's code he scored 2 into 66
that is 132 runs so Tony's score is 132
and holy score is 66 thank you please
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