)suppose an operating system allocates time slices in 10 millisecond (1/1000 second) units and the time required for a context switch is negligible. how many processes can obtain a time slice in one second?

(1 second)*(1 process)/(10/1000 second) = 1000/10 processes = 100 processes

100 processes can obtain a time slice in 1 second.

since proposition states that a number is greater than 25, if is true then the number must actually be greater than 25.

this implies that all possible options, except 24, can be accepted

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: