6.
The percentage of metals in a mine of lead ore is 60%. Now the percentage of silver is $$\frac{3}{4}$$% of metals and the rest is lead. If the mass of ore extracted from this mine is 8000 kg, the mass (in kg.) of lead is :

7.
If 120 is 20% of a number, then 120% of that number will be :

8.
498 is 17% less than a number then the number is :

9.
If radius of a circle is increased by 5%, then the increase in it's area is :

10.
If 60% of A's income is equal to 75% of B's income, then B's income is equal to x% of A's income. The value of x is :

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