Question

If $\frac{2}{3}j-\frac{1}{4}k=\frac{5}{2}$, the value of $8j-3k$ is equal to

• A. $30$
• B. $50$
• C. $100$
• D. $140$

Answer 1

The correct option is A $30$

Given, $\frac{2}{3}j-\frac{1}{4}k=\frac{5}{2}$

Multiplyig given equation by $12$, we get

$\frac{2}{3}\times 12j-\frac{1}{4}\times 12k=\frac{5}{2}\times 12$

$\Rightarrow 8j-3k=30$