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4 : 7 = 20 : 35

Answer:

True.

Consider the two ratio, 4: 7 = 20: 35

= 4/7 = 20/35

20/35 is further simplified by dividing both numerator and denominator by 5 we get,

4/7

Therefore, 4/7 = 4/7

"hello students welcome to lido q a video
session i am seth
your math tutor and question for today
is a plastic box
1.5 meter long 1.25 meter wide and 65
centimeter d
is to be made it is to be opened at the
top
ignoring the thickness of the plastic
sheet determine
first the area of the sheet that is
required for making the box
second the cost of the sheet for it if
a sheet measuring one meter square cost
rupees
20 so let us see first of all what is
given
given is the length of the plastic box
length of plastic box
l will be equal to 1.5 meter
breadth
b will be equal to 1.25 meter
and height h
will be equal to 0.65 meter and that is
given
here centimeter which is given in as a
height is converted directly into meter
as 0.65 meter
now let us find the first one the area
of the sheet required
for making the box so first one
it can be found by first of all
the box is to be open at the top
and hence the area of the sheet required
will be two into
length into breath plus two into breath
into height
and one end is not there so we will take
one time
length into breadth let us write it down
so area of the sheet required
will be equal to 2 into
length into breath
or we can write like this 2 into
length into height plus 2 into breath
into height
plus 2 into length
into breath but here one end is open
so we don't have to write 2 into length
into breath we just have to write 1
times
length into breath so it is understood
now
that the box is to be open at the top
right down here in the bracket
so finally we can substitute the
respective values
2 into 1.5 into 0.65
plus 2 into
1.25
into 0.65
plus 1.5 into 1.25
and that is meter square
so we can finally write here one point
nine five plus one point six
six two five
plus 1.875
meter square will be finally equal to
5.45 meter square
that is our area of the sheet required
denoted by a so first part is solved let
us see the second part
in the second part you have been given
that the cost of the sheet for it if a
sheet measuring 1 meter square
cost rupees 20 we have found the area
over here
at below and that is 5.45 meter square
now let us find the cost of sheet
for it
so cost of sheet per meter square is
given
so this is the second part
so how much will be the cost of sheet
5.45 meter square
will be equal to 20 into 5.45
and hence we can finally solve it over
here
like cost
will be equal to that is required cost
20 into 5.45
and that is equal to 109 rupees
so area of
sheet required
is 5.45 which we founded previously
meter square and cost
of sheet
is equal to 109 rupees
so these are our answers if you have any
query you can post it in the comment
section
and subscribe to lido for more such q a
thank you for watching
"

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