A quantity m varies jointly with p and r When p is 2 and r is 4 , m is 1 What is the constant of variation?
Answer
A
2
B
8
C
1 half
D
1 eighth
Explanation
Joint variation means m = kpr, where k is the constant of variation. Substitute m = 1, p = 2, and r = 4: 1 = k(2)(4), so k = 1/8. The constant is 1 eighth, choice D.
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