Explanation

Let  ? = X

(2567/17) × 3 = X + 180

151 × 3 = X + 180

453 = X + 180

X = 453 – 180

X = 273

Explanation

-7m-[3n-{8m- (4n-10m)}] = ?

= - 7m - [ 3n - { 8m - (-10m +4n)]

= - 7m - [ 3n -( 8m +10m -4n )]

= -7m - (3n  - (18m -4n )

= -7m - (3n +4n - 18m)

= -7m - (7n - 18m)

= 11m  - 7n

Explanation

1

x=ya⇒xc=yac
⇒z=yac so zb=yabc=y′
∴abc=1

Explanation

Explanation

-1

Explanation

Explanation

Explanation

17m

Area of the rectangular carper =120 cm2
Perimeter =46 m
2(l+b)=46
(l+b)=46/2

l+b=23

And, length × breadth=120

Now, we know that :

(l−b)2=(l+b)2−4lb
(l−b)2=(23)2−4×120
(l−b)2=529−480
(l−b)2=49

(l−b)2=(7)2

Hence, l−b=7

And l+b=23

By adding, we get 2l=30
l=30/2

l=15

and, b=23−15

b=8

Diagonal =(l2+b2)​
=(15)2+(8)2​
=(225+64)​
=(289)​
=17 m

Explanation

21

Solution

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Explanation

54 m²

∴ The area of the four walls of the room is 54 m².

Think of the floor as a square. Suppose the  wall is 20 feet long. Multiply 20  by 4 to get a circumference of 80 feet. Double the width and length measurements and add them  to calculate the perimeter of the rectangular room.