Question

w varies jointly as x and y and inversely as the square of z. If w = 280 when x = 30, y = 12, and z = 3, find w when x = 20, y = 10 and z = 2.
a. 350
b. 117
c. 69
i got C??

Answer 1

a. 350

Answer 2

\[w=k \times xy/z ^{2}\]
k=7