Question

When

Answer 1

Answer:

$\frac{1}{3} k + \frac{1}{4} k = 1 \\ \frac{4k + 3k}{12} = 1 \\ 7k = 12 \\ k = \frac{12}{7}$

is youranswer

Answer 2

ANSWER:

1/3k + 1/4k = 1

4 + 3/12k = 1

7/12k = 1

k = 12/7.

So, Correct choice - [B] 12/7.