It takes chris 9 hours longer to construct a fence than it take tony. if they work together, they caan construct the fence in 20 hours. how long would it take each man working alone?

ANSWER

Tony: 36 hours

Chris: 45 hours

EXPLANATION

If it takes Tony x hours to construct the fence, then it will take Chris (x+9) hours.

Tony's rate is

Chris' rate is

Their combined rate in terms of x is

Their combined rate must equal

This implies that;

Cross multiply,

Expand;

This implies that,

We discard the negative value.

Hence

Therefore it will take Tony 36 hours and Chris 45 hours.

answer: the answer is one of

step-by-step explanation:   we are given to write a proper fraction where the whole is divided into an even number of equal parts less than ten, and an odd number of those parts exist.

an even number less than 10 may be one of 2, 4, 6 or 8. so, the whole may be one of these four evens.

now, an odd number of these parts must exist, so the numerator must be an odd number, one of 1, 3, 5 or 7. it cannot be 9 because then the fraction will become improper.

thus, our fraction may be one of the following

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value