Explanation

 Pattern is ×2 + 1 → (4×2+1 = 9),

(9×2+1 = 19),

(19×2+1 = 39),

(39×2+1 = 79)

Explanation

A person walks:

- 3 km North

- 4 km East

- 3 km West

Net East-West movement = 4 km East - 3 km West = 1 km East  

North movement = 3 km

Distance from the starting point = √(3² + 1²) = √(9 + 1) = √10 ≈ 3.16 km

So, the person is approximately 3.16 km away from the starting point.

Explanation

The result of 15 × 6 ÷ 2 is:

15 × 6 = 90  

90 ÷ 2 = 45  

Explanation

 Plastic (It is not a natural mineral or metal)

Explanation

1 ÷ 25 = 0.04  

0.04 × 100 = 4 

Explanation

Given: 3x = 12  

To find x, divide both sides by 3:  

x = 12 ÷ 3  

x = 4  

Explanation

Work is inversely proportional to workers: 6×8 = 4×x → x = 12

Explanation

These are all perfect squares:

- 121 = 11²  

- 144 = 12²  

- 169 = 13²  

- 196 = 14²  

Next number should be:

- 15² = 225

Explanation

The rearranged word "APJAN" forms the name of a country — Japan. 

Explanation

If yesterday was Sunday, then today is Monday.

- Tomorrow → Tuesday  

- Day after tomorrow → Wednesday