Question

$( \frac{1}{3} - \frac{2}{5} ) \div \frac{2}{5} + \frac{2}{3} - ( \frac{3}{4} + \frac{15}{2} \times \frac{1}{20} )$
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Answer 1

(5/15-6/15):2/5+2/3-(3/4+15/40)
-1/15:2/5+2/3-(30/40+15/40)
-5/30+2/3-45/40
-1/6+2/3-9/8
-4/24+16/24-27/24
12/24-27/24
-15/24
-5/8