The percentage of metals in a mine of zinc ore is 60%. Now the percentage of silver is 3/4% of metals and the rest is zinc. If the mass of ore extracted from the mine is 8000 kg, the mass (in kg) of zinc is

Correct Answer: 21000

Explanation:

6% of 350000

 

$$\begin{gathered} 6 100 x 3 , 50 , 000 \\ = 6 x 3500 \\ = 21 , 000 . \end{gathered}$$

 

Hence, 6% of 3,50,000 = 21,000.

Correct Answer: 24

Explanation:

20% of 120

20 x 120/100

= 4 x 6

= 24

 

Hence, 20% of 120 = 24.

Correct Answer: 20

Explanation:

From the given data,

 

$$\begin{gathered} 40 100 x 75 + 80 100 x 25 = K 100 x 250 \\ 30 + 20 = 5 K 2 \\ 50 x 2 = 5 K \\ K = 100 5 = 20 \end{gathered}$$

Correct Answer: 46.875

Explanation:

75% of 450 + ? % of 560 = 600 

$$\begin{gathered} 75 x 450 100 + ? x 560 100 = 600 \\ 75 x 9 2 + 28 p 5 = 600 \\ 75 x 9 x 5 + 56 p 10 = 600 \\ 3375 + 56 p = 6000 \\ 56 p = 2625 \\ p = 46 . 875 \end{gathered}$$

 

Hence, in the given question ? = 46.875

Correct Answer: 8400

Explanation:

12% of 70,000

=> 12 x 70,000/100

=> 8400

 

Hence, 12% of 70,000 = 8,400

Correct Answer: 60

Explanation:

The given sentence 21 is 35 of what number means that 

21 is 35 % of what number

Let that number be P

=> 35P/100 = 21

35P = 2100

P = 2100/35 = 300/5 = 60

 

Hence, 21 is 35 of 60.

Correct Answer: 350

Correct Answer: 88

Correct Answer: 28.75

Correct Answer: 105