Question

solve the question as fast as you can​

Answer 1

Answer:

(a)

l*b = 3x

(x-5)8=3x

8x-40=3x

8x-3x=40

5x=40

x=8cm

(b)

2(l+b)=40

2((x-5)+8)=40

x-5+8=20

x+3=20

x=17cm

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Answer 2

Given :

• Length of rectangle = x - 5 cm
• Breadty of rectangle = 8 cm
• Area of rectangle = 3x cm²
• Perimeter of rectangle = 40 cm

To Find :

• Value of x

Solution :

Case 1 :-

Area of rectangle = L * B

➨ 3x = ( x - 5 ) * 8

➨ 3x = 8x - 40

➨ 3x - 8x = - 40

➨ - 5x = - 40

➨ x = - 40 / - 5

➨ x = 8

Case 2 :-

Perimeter of rectangle = 2 ( L + B )

➨ 40 = 2 ( x - 5 + 8 )

➨ 40 = 2 ( x + 3 )

➨ 40 = 2x + 6

➨ 2x = 40 - 6

➨ 2x = 34

➨ x = 34 / 2

➨ x = 17