Let P1 and P2 be the proportion of boys in each year.
In order to compare them we should pur the two proportions into simple forms.
P1 = (Number of boys) / (Total number of students)
P1 = 110 / 200 and, simplifying the fraction by 10 we get
P1 = 11 / 20
Similarily, P2 = 140 / 250 = 14 / 25
Now we need to compare 11/20 with 14/25
In the first fraction, we multiply both the numerator and the denominator by 5 to get
11/20 = 55 / 100 = 55%
Similarily, we multiply the second fraction by 4, getting
14/25 = 56/100 = 56%
Therefore, the first proportion is greater than the other.