Question

A quantity x varies inversely as the product of y and z. When y = 7 and z = 8, then x = 5. What is the value of x when y = 4 and z = 10?

Answer 1

let xy=k,where k is constant of variable .
since k=xy means
here in x place used as y & y -z
already as we k=yz, k=7×8,k=56
Now,
y=4&z=10 k=yz,k=4×10,k=40
then,
X=5. Y=K/Z=56+40/5=96/5=19.2
I HOPE IT'S CORRECT AND HELP FOR U