SOLUTION: 1) A person with a mass of 80kg contains 50kg of water. How many kilograms of water are in a person with a mass of 64kg? 2) The stopping distance, d of a particular car after th

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: 1) A person with a mass of 80kg contains 50kg of water. How many kilograms of water are in a person with a mass of 64kg? 2) The stopping distance, d of a particular car after th      Log On


   

Question 1085591: 1) A person with a mass of 80kg contains 50kg of water. How many kilograms of water are in a person with a mass of 64kg?
2) The stopping distance, d of a particular car after the brakes are applied varies directly as the dquare of rate, r. If the car is traveling 25mph, if can stop in 50ft. How many feet will it take the same care to stop when it is traveling 50mph?
3) If there are 535 members of congress and 45 more republicians than democrats, how many of each party are there, assuming that there is no independents?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
50 is to 80 as X is to 64.
50%2F80=X%2F64
X=%2850%2F80%2964
.
.
d=kr%5E2
k=d%2Fr%5E2
So,
50%2F25%5E2=Y%2F50%5E2
Y=50%2850%2F25%29%5E2
.
.
.
D%2BR=535
and
R=45%2BD
Substituting,
D%2B45%2BD=535
2D=490
Solve for D then use either equation to solve for R.