Question

The variable z is directly proportional to x, and inversely proportional to y. When x is 11 and y is 14, z has the value 7.8571428571429. What is the value of z when x= 15, and y= 22

Answer 1

Z=kx/y

7.9=k11/14

Cross multiply

K11=7.9x14

K =7.9x14/11

K=10.1

........

Z= kx15/22

Z=10.1x15/12

Z=12.625