Answer:
112
Step-by-step explanation:
Given z is directly proportional to x then the equation relating them is
z = kx ← k is the constant of proportionality
To find k use the condition x = 3 when z = 48
k = [tex]\frac{z}{x}[/tex] = [tex]\frac{48}{3}[/tex] = 16, thus
z = 16x ← equation of proportionality
When x = 7, then
z = 16 × 7 = 112
