Fred and his sons, Tom and Bill, built a recreation room in their basement. Fred worked twice as many hours as Tom, and Bill worked 10 hours more than Tom. Altogether the three of them worked 94 hours. How many hours did Fred work?​

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.