1/4(60+16s)=15+4s
\(\frac{1}{4}\times(60+16s)=15+4s\)
\(\frac{60}{4}+\frac{16}{4}s=15+4s\)
\(15+4s=15+4s\)
\(4s=0+4s\)
\(0=0\)
\(s\) = all real numbers
+1904 
