So, first we have to put in an equation
9/20+ 2 9/10
multiply 9/10 by 2
So you get 9/20+ 2 18/20
Add the fractions together and you'll get 26/20
since their isn't a whole number a whole number it's just 2 and 26/20 reduce it to
2 and 9/5
I hope this is right. This is how I was taught.