Question

plzz q.no 14 copy me bana ke photo bhejo

Answer 1

Hi !!!

This is your answer....

Given :-

Dimensions of marble slab = 40 × 20 cm².

It is given that there marbles has to be laid around a square park of 18 cm to a width of 2m.

It means that the marble will be laid around the all four sides of the park with a distance of 2 m from the sides.

So, to calculate the area where the marbles has to put, we will .............

1). Obtain the area of whole square, that is
(side = 18 m) so, area = 18× 18 = 324 m².

then we will calculate that area where the marbles will not be laid.

According to the question, marbles will be laid around the park to a width of 2 m. So, the area where the marbles will not be laid will be in the form of square whose side will be (18-2) 16 m.

Area where the marbles will not be laid = 16 × 16 = 256 m².

Hence,the area where the marbles will be laid = area of whole square - area of square (of 16m).
= 324 - 256
= 68 m².

Hence,the area where the marbles will be laid is 68 m².

Now, area of one marble = (40×20) cm²
= 800 cm².

As the area of marble slab and area of square park are in different units. Let us first convert them in Same units.

We know that 1 m² = 10000 cm².

So, 68 m² =
68 × 10000 = 680000 cm².

Therefore, no of marble slabs that has to be put

$= \frac{area \: where \: the \: marbles \: will \: be \: laid}{area \: of \: one \: marble \: slab}$
$= \frac{680000}{800} \\ = 850$
Hence, the number of marble slab that will be laid are 850.

Hope it helps.......