book Maths Puzzle Numerical Ability

Find the constant of variation K. m varies directly with n;m=144 when n=8

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I WANT TO KNOW IF YOU HAVE PRACTICE QUIZZES FOR MATH 1000 ON LINE AND PRACTICE EXAMS ONLINE THAT WILL HELP ME FOR MY EXAM
AND A COMPREHENSIVE ONE OF ALL THE EXAMS LIKE A CUMALITIVE FINAL AND MIDTERM Solve the system.

6y + w = -10

x + y + 3z - w = 13

6x + z + 3w = 14

x + y + 5z = 13