The total amount of CD's are 100% so 100 - (20+60) = 20% -> the percentage of the other types of music. Then multiply 20% by 20 to get 4. So there are 4 CD's that are other types of music
<h3>y = kx.</h3><h3>=> 40=k X 4</h3><h3>=> k=10</h3><h3>So y=10x</h3><h3>If we put y=23 in the above equation,</h3><h3>x=2.3</h3><h3 /><h3>or </h3><h3 /><h3>40:4 = 23:x</h3><h3>=>x=2.3</h3>