z varies joinly as x and y,and inversely as t,if z=12,k=3,y=20 and t=5,find z if x=15,y=14 and t=8​

Sagot :

Problem:

z varies jointly as x and y,and inversely as t,if z=12,k=3,y=20 and t=5,find z if x=15,y=14 and t=8​

Solution:

k = constant of variation

z = kxy/t

12 = k(3)(20)/5

12(5) = 60k

60/60=k

k = 1

z = kxy/t

z = 1(15)(14)/8

z = 210/8

z = 105/4

z = 26.25

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