There are 16 students in class 61, one third of boys and one fourth of girls. There are 19 students in class 61, one third of girls and one fourth of boys

There are 16 students in class 61, one third of boys and one fourth of girls. There are 19 students in class 61, one third of girls and one fourth of boys

sixty
Let X be the number of boys and y be the number of girls
1/3X+1/4Y=16
1/4X+1/3Y=19
Add the above two formulas to get
1/3x+1/4y+1/4x+1/3y=(1/3+1/4)(x+y)=16+19
So x + y = 60