Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Algebra

Question:

If \(\frac{3 - 5x}{2x}\) + \(\frac{3 - 5y}{2y}\) + \(\frac{3 - 5z}{2z}\) = 0, then the value of \(\frac{3}{x}\) + \(\frac{3}{y}\) + \(\frac{3}{z}\) is?

Options:

10

15

45

60

Correct Answer:

15

Explanation:

\(\frac{3 - 5x}{2x}\) + \(\frac{3 - 5y}{2y}\) + \(\frac{3 - 5z}{2z}\) = 0

equate all 3 parts separately with zero

i) \(\frac{3 - 5x}{2x}\) = 0 ⇒  x = \(\frac{3}{5}\)

ii) \(\frac{3 - 5y}{2y}\) = 0 ⇒ y = \(\frac{3}{5}\)

iii) \(\frac{3 - 5z}{2z}\) = 0 ⇒ z = \(\frac{3}{5}\)

 

Put these values in ⇒

\(\frac{3}{x}\) + \(\frac{3}{y}\) + \(\frac{3}{z}\) = \(\frac{3\;×\;5}{3}\) + \(\frac{3\;×\;5}{3}\) + \(\frac{3\;×\;5}{3}\) = 15