Direction : What value should come in the place of question mark (?) in the following questions?

80% of 10% of 340 = ?

Find the value of x:
2³ × 3⁴ × 1080 ÷ 15 = 6^x

There are some boys and girls in a room. The square of the number of the girls is less than the square of the number of boys by 28. If there were two more girls, the number of boys would have been the same as that of the girls. The total number of the boys and girls in the room are

If (a + b):(b + c):(c + a) = 7:6:5 and a + b + c = 27, then what will be the value of 1/a: 1/b :1/c?

is equal to : 

What is the value of x ?

The value of is

If 12x – 15 y =9x + 5y, the value of is