Verified Answer :

TSO

'of' in mathematics means multiplication

% or percent means over 100, so 15% means 15/100

\(\frac{15}{100} \times 60 = \frac{15}{10}\times 6 = \frac{15}{5} \times 3 = 3\times 3= \boxed{9}\)

So, 15% of 60 isĀ 9. :D