जर $\dfrac{a}{b} = \dfrac{3}{5}$ असेल, तर $\dfrac{a+b}{a-b}$ चे मूल्य शोधा.
A$4$
B$-4$
C$\dfrac{8}{2}$
D$-2$
Answer & Solution
Correct answer: B. $-4$
योग-वियोग (componendo-dividendo) नियमानुसार, जर $\dfrac{a}{b} = \dfrac{c}{d}$ असेल तर $\dfrac{a+b}{a-b} = \dfrac{c+d}{c-d}$.
$c = 3, d = 5$ ठेवून: $\dfrac{3+5}{3-5} = \dfrac{8}{-2} = -4$.
चिन्ह सोडून देऊन पर्याय C निवडणे ही एक सामान्य चूक आहे
$a < b$ कडे लक्ष द्या, ज्यामुळे छेद ऋण होतो.
Keep practising Ratio and Proportion
Browse all Ratio and Proportion questions for RRB NTPC, or explore more Quantitative Reasoning topics.
Related questions
₹$5400$ is divided among A, B and C in the ratio $3 : 5 : 7$. How much does B receive?Find the compounded ratio of $(2 : 3)$, $(5 : 7)$ and $(4 : 9)$.Find the mean proportional between $16$ and $25$.Find the fourth proportional to $4$, $9$ and $12$.Which of the following is equivalent to the ratio $4 : 5$?