Apositive integer is twice another. the sum of the reciprocals of the two positive integers is 3/10. find the two integers.

Let's call the integers and . The first information (one is twice the other) translates as .

The second information about the sum of reciprocals can be written as

But since we know that , we can rewrite this expression as

Since the numerators of both fractions equal 3, then the denominators must be equal as well. So, we have

And since we know that .

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.