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20 POINTS!!!
If A varies directly as B and inversely as C and when A = 6, B = 10 and C = 15. Calculate C when A = 92 and B= 107

Sagot :

Answer:

C = [tex]\frac{963}{92}[/tex]

Step-by-step explanation:

given A varies directly as B and inversely as C then the equation relating them is

A = [tex]\frac{kB}{C}[/tex] ← k is the constant of variation

to find k use the condition A = 6 , B = 10 , C = 15 , then

6 = [tex]\frac{x10k}{15}[/tex] ( multiply both sides by 15 )

90 = 10k ( divide both sides by 10 )

9 = k

A = [tex]\frac{9B}{C}[/tex] ← equation of variation

when A = 92 and B = 107 , then

92 = [tex]\frac{9(107)}{C}[/tex] ( multiply both sides by C )

92C = 963 ( divide both sides by 92 )

C = [tex]\frac{963}{92}[/tex]

Answer:

C = 963/92

Step-by-step explanation:

Given :

  • A ∝ B
  • A ∝ 1/C

Finding the constant of variation, k

  • A = kB/C
  • 6 = k(10)/(15) [Given in 1st part of question]
  • 6 = 2k/3
  • 2k = 18
  • k = 9

Finding C

  • Using the same equation, and new values of A and B, we can find C
  • A = kB/C
  • C = kB/A
  • C = 9 x 107 / 92
  • C = 963/92