Engineering Board Exam Reviewer · Variation & Proportion · medium
z varies jointly as x and the square root of y. If z=24 when x=3 and y=16, find z when x=5 and y=9.
- 40
- 30
- 20
- 45
Answer
B. 30
Solution
z=kx y with k=24/3·4=2. Then z=2(5)(3)=30.
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