5 tenths - 3 tenths is 2 tenths.
[/tex]\frac{2}{10}=\frac{2 \div2}{10 \div2} = \frac{1}{5}[/tex] So it's A. Hope this helps you. All you had to do is SIMPLIFY at the end. Simplify means to put numerator and ddenominator the the least or smallest possible digit, using only whole numbers.