Explanation

Explanation

This is an inverse proportion problem.

Formula:

Given:

• Men₁ = 39
• Days₁ = 29
• Men₂ = 29
• Days₂ = ?

Last updated 18-07-2026 by NA

Explanation

(x+7) x 3-5/ 4 = 7 

3 ( x+7) - 5 = 7 x 4 

3x + 21 -5 = 28 

3x + 16 = 28 

3x = 28 -26 

3x = 12

x = 12/3

x = 4

***

Last updated 17 July 2026 by NA

Explanation

• The sum of the three interior angles of a triangle is 180°.
• This rule applies to all types of triangles.
• If two angles are known, the third angle = 180° − (sum of the other two angles).
• It is a basic rule of geometry.
• This property is known as the Angle Sum Property.

Last updated 17 july 2026 by NA

Explanation

Given:

Increment in number = 20% of the number

Decrement in number = 20% of the new number

Concept used:

Net increase or decrease percent = {(Original number or Final number) - (Final number or original number) ÷ Original number} × 100

Calculation:

Let the original number be 100

When the number is increased by 20%

New Number = 100 + 20% of 100

⇒ 100 + 20

⇒ 120

Now, the number is decreased by 20%

Final number = New number – 20% of new number

⇒ 120 – 20% of 120

⇒ 120 – 24

⇒ 96

∴ Net Decrease in percentage = { (100 – 96) / 100} × 100

⇒ {4/100} × 100

⇒ 4%

∴ The net decrease percentage is 4%.

Last verified on 11-07-2026