Jack, walker, and trust have $100 altogether. Jack has $20 more than Walker. Trust has $14 more than walker. How much money does Jack have?

Jack has $42

Step-by-step explanation:

Let be "j" the amount of money in dollars that Jack has, "w"  the amount of money in dollars that Walker has and "t"  the amount of money in dollars that Trust has.

You know that they have $100 altogether, then you can write the following equation:

  [Equation 1]

Jack has $20 more than Walker, then:

     [Equation 2]

And  Trust has $14 more than walker, then you can write this equation:

     [Equation 3]

Substitute the  Equation 2 and the  Equation 2 into the first one:

Now, solve fo "w":

Finally, substiute the value of "w" into the Equation 2 and evaluate:

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."