SOLUTION: The ratio of the sum of K and 12 to 15 is the same as the ratio of 30 to 25. What's K? A. 5 B. 6 C. 7 D. 13 E. 17

Algebra ->  Finance -> SOLUTION: The ratio of the sum of K and 12 to 15 is the same as the ratio of 30 to 25. What's K? A. 5 B. 6 C. 7 D. 13 E. 17      Log On


   

Question 1015084: The ratio of the sum of K and 12 to 15 is the same as the ratio of 30 to 25. What's K?
A. 5
B. 6
C. 7
D. 13
E. 17
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

%28K+%2B12%29+%2F+15+=+30+%2F+25
%28K+%2B12%29++=+%2830+%2F25%29%2A15...simplify
%28K+%2B12%29++=+%2830+%2Fcross%2825%295%29%2Across%2815%293
%28K+%2B12%29++=+%28cross%2830%296+%2Fcross%285%29%29%2A3
K+%2B12=+6+%2A3
K+=+18-12
K+=+6
answer: B. 6