we have the numbers
1/2 and 2/5
the given fractions don't have the same denominator
so
Find out an equivalent fraction
1/2 -----> multiply by 5/5
(1/2)*(5/5)=5/10
2/5 ----> multiply by 2/2
(2/5)*(2/2)=4/10
Now compare the fractions
5/10 is greater than 4/10
so
1/2 > 2/5