( 12/jk ) x ( 3k/4 ) = 9/j
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D = 3K; D + 12 + K + 12 = 10K so 3K + 12 + K + 12 = 10K so 24 = 6K Kumar is 4 and Dollah is 12. In 12 years they will be 16 and 24, total 40 which is 10 times Kumar's present age. Job done.
By using algebra.
K/3 + k/4 = 1 LCD=12 *divide lcd by denominator* K(4) + K(3) = 12(1) 4k + 3k = 12 7k = 12 k=12/7
k = 10 3k = 30 When a number appears next to a variable (like "k") it usually means multiply the number times the variable.
1k/2k, 2k/4k, 3k/6k and so on.