Question 1144888
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Here is a slightly different path to the solution than shown by the other tutor.... Neither solution is any "better" than the other.<br>
{{{(K+12)/15 = 30/25}}}
{{{(K+12)/15 = 6/5}}}  [simplify the fraction on the right]
{{{(K+12)/15 = 18/15}}}  [noting that 15 is a multiple of 5, write the fraction on the right as an equivalent fraction with denominator 15]
{{{K+12 = 18}}}
{{{K = 18-12 = 6}}}